diff --git a/mobile/library_management/.gitignore b/mobile/library_management/.gitignore
new file mode 100644
index 0000000..3a85790
--- /dev/null
+++ b/mobile/library_management/.gitignore
@@ -0,0 +1,3 @@
+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/
diff --git a/mobile/library_management/CHANGELOG.md b/mobile/library_management/CHANGELOG.md
new file mode 100644
index 0000000..effe43c
--- /dev/null
+++ b/mobile/library_management/CHANGELOG.md
@@ -0,0 +1,3 @@
+## 1.0.0
+
+- Initial version.
diff --git a/mobile/library_management/README.md b/mobile/library_management/README.md
new file mode 100644
index 0000000..3816eca
--- /dev/null
+++ b/mobile/library_management/README.md
@@ -0,0 +1,2 @@
+A sample command-line application with an entrypoint in `bin/`, library code
+in `lib/`, and example unit test in `test/`.
diff --git a/mobile/library_management/analysis_options.yaml b/mobile/library_management/analysis_options.yaml
new file mode 100644
index 0000000..dee8927
--- /dev/null
+++ b/mobile/library_management/analysis_options.yaml
@@ -0,0 +1,30 @@
+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options
diff --git a/mobile/library_management/bin/library_management.dart b/mobile/library_management/bin/library_management.dart
new file mode 100644
index 0000000..476f1d2
--- /dev/null
+++ b/mobile/library_management/bin/library_management.dart
@@ -0,0 +1,959 @@
+// import 
+import 'dart:async';
+import 'dart:developer';
+import 'dart:io';
+import 'dart:isolate';
+
+// enum
+enum BookStatus { available, loaned, reserved }
+
+enum MemberTier { standard, premium }
+
+// enum
+
+
+
+
+
+
+
+
+
+
+
+
+//  exceptions
+class BookNotFoundException implements Exception {
+  final String message;
+  BookNotFoundException(this.message);
+  @override
+  String toString() => message;
+}
+
+class MemberNotFoundException implements Exception {
+  final String message;
+  MemberNotFoundException(this.message);
+  @override
+  String toString() => message;
+}
+
+class InvalidLoanException implements Exception {
+  final String message;
+  InvalidLoanException(this.message);
+  @override
+  String toString() => message;
+}
+
+// exceptions
+
+
+
+
+
+
+
+
+
+
+
+// mixins
+mixin Timestampable {
+  DateTime? createDat;
+  DateTime? updateDat;
+  void markCreated() {}
+  void markUpdated() {}
+  String getTimestampInfo();
+}
+mixin Searchable {
+  bool matchesQuery(String query);
+  List<String> getSearchableFields();
+}
+
+// mixins
+
+
+
+
+
+
+
+
+
+
+
+
+//  abstract 
+abstract class LibraryItem {
+  String id;
+  String title;
+  LibraryItem(this.id, this.title);
+  String getDetails();
+  Map<String, dynamic> toMap();
+  void printInfo();
+}
+
+abstract class Borrowable {
+  bool isAvailable();
+  void borrow(String memberId);
+  void returnItem();
+}
+
+//  abstract 
+
+
+
+
+// classes
+
+class Book extends LibraryItem
+    with Timestampable, Searchable
+    implements Borrowable {
+  String author;
+  String? isbn;
+  String? description;
+  BookStatus status;
+  Set<String> genreTags;
+  String? currentBorrowerTd;
+  int pages;
+  Book(String id, String title, this.author)
+    : status = BookStatus.available,
+      genreTags = {},
+      pages = 0,
+      super(id, title);
+  Book.fromMap(Map<String, dynamic> map)
+    : author = map['author'] ?? '',
+      isbn = map['isbn'],
+      description = map['description'],
+      status = map['status'] ?? BookStatus.available,
+      genreTags = Set<String>.from(map['genreTags'] ?? []),
+      currentBorrowerTd = map['currentBorrowerTd'],
+      pages = map['pages'] ?? 0,
+      super(map['id'] ?? '', map['title'] ?? '');
+  Book.withGenres(
+    String id,
+    String title,
+    this.author, {
+    Set<String>? initialGenres,
+  }) : status = BookStatus.available,
+       genreTags = initialGenres ?? {},
+       pages = 0,
+       super(id, title);
+  @override
+  String getDetails() {
+    return "ID: $id | Title: $title | Author: $author | Status: $status";
+  }
+
+  @override
+  Map<String, dynamic> toMap() {
+    return {
+      "id": id,
+      "title": title,
+      "author": author,
+      "isbn": isbn,
+      "description": description,
+      "status": status,
+      "genreTags": genreTags.toList(),
+      "pages": pages,
+    };
+  }
+
+  @override
+  bool isAvailable() {
+    if (this.status == BookStatus.available) return true;
+    return false;
+  }
+
+  @override
+  void borrow(String memberId) {
+    if (!isAvailable()) {
+      BookNotFoundException('not fond book');
+      return;
+    }
+    this.status = BookStatus.loaned;
+    currentBorrowerTd = memberId;
+    markUpdated();
+  }
+
+  @override
+  void returnItem() {
+    this.currentBorrowerTd = null;
+    this.status = BookStatus.available;
+    markUpdated();
+  }
+
+  @override
+  bool matchesQuery(String query) {
+    query = query.toLowerCase();
+    return title.toLowerCase().contains(query) ||
+        author.toLowerCase().contains(query) ||
+        genreTags.any((g) => g.toLowerCase().contains(query));
+  }
+
+  @override
+  List<String> getSearchableFields() {
+    return [title, author, ...genreTags];
+  }
+
+  void updateStatus(BookStatus newStatus) {
+    this.status = newStatus;
+  }
+
+  void addGenre(String genre) {
+    this.genreTags.add(genre);
+  }
+
+  String getStatusText() {
+    return status.toString().split('.').last;
+  }
+  @override
+void printInfo() {
+  print(getDetails());
+}
+
+@override
+String getTimestampInfo() {
+  return "Created at: ${createDat ?? 'unknown'}, Updated at: ${updateDat ?? 'unknown'}";
+}
+
+@override
+void markCreated() {
+  createDat = DateTime.now();
+}
+
+@override
+void markUpdated() {
+  updateDat = DateTime.now();
+}
+}
+
+class Member with Timestampable {
+  String id;
+  String name;
+  String? email;
+  String? phone;
+  MemberTier tier;
+  List<String> loanHistory;
+  Member(this.id, this.name, this.tier)
+    : phone = null,
+      loanHistory = [],
+      email = null;
+  Member.fromMap(Map<String, dynamic> map)
+    : id = map['id'],
+      name = map['name'],
+      email = map['email'],
+      phone = map['phone'],
+      tier = map['tier'] ?? MemberTier.standard,
+      loanHistory = List<String>.from(map['loanHistory'] ?? []);
+
+  Member.premium(String id, String name, {String? email})
+    : id = id,
+      name = name,
+      email = email,
+      phone = null,
+      tier = MemberTier.premium,
+      loanHistory = [];
+  Map<String, dynamic> toMap() {
+    return {
+      "id": id,
+      "name": name,
+      "email": email,
+      "phone": phone,
+      "tier": tier,
+      "loanHistory": loanHistory,
+    };
+  }
+
+  void addToHistory(String bookId) {
+    loanHistory.add(bookId);
+  }
+
+  int getMaxLoans() {
+    if (this.tier == MemberTier.standard) return 3;
+    return 10;
+  }
+
+  bool canBorrow() {
+    if (this.loanHistory.length == this.getMaxLoans()) return false;
+    if (this.loanHistory.length > this.getMaxLoans()) return false;
+    return true;
+  }
+
+  String getMemberInfo() {
+    return 'name : ${this.name} email : ${this.email} id : ${this.id} phone : ${this.phone} tier : ${tier}';
+  }
+
+  void upgradeTier() {
+    if (this.tier == MemberTier.standard) {
+      this.tier = MemberTier.premium;
+    }
+  }
+  @override
+@override
+String getTimestampInfo() {
+  return "Created at: ${createDat ?? 'unknown'}, Updated at: ${updateDat ?? 'unknown'}";
+}
+
+@override
+void markCreated() {
+  createDat = DateTime.now();
+}
+
+@override
+void markUpdated() {
+  updateDat = DateTime.now();
+}
+}
+
+class Loan {
+  String loanId;
+  String bookId;
+  String memberId;
+  DateTime loanDate;
+  DateTime? dueDate;
+  DateTime? returnDate;
+  bool isReturned;
+  Loan(this.loanId, this.bookId, this.memberId)
+    : loanDate = DateTime.now(),
+      dueDate = null,
+      returnDate = null,
+      isReturned = false;
+  Loan.withDueDate(
+    String loanId,
+    String bookId,
+    String memberId, {
+    int dueDays = 14,
+  }) : loanId = loanId,
+       bookId = bookId,
+       memberId = memberId,
+       loanDate = DateTime.now(),
+       dueDate = DateTime.now().add(Duration(days: dueDays)),
+       returnDate = null,
+       isReturned = false;
+  Loan.fromMap(Map<String, dynamic> map)
+    : loanId = map['loanId'],
+      bookId = map['bookId'],
+      memberId = map['memberId'],
+      loanDate = DateTime.parse(map['loanDate']),
+      dueDate = map['dueDate'] != null ? DateTime.parse(map['dueDate']) : null,
+      returnDate = map['returnDate'] != null
+          ? DateTime.parse(map['returnDate'])
+          : null,
+      isReturned = map['isReturned'] ?? false;
+  Map<String, dynamic> toMap() {
+    return {
+      "loanId": loanId,
+      "bookId": bookId,
+      "memberId": memberId,
+      "loanDate": loanDate.toIso8601String(),
+      "dueDate": dueDate?.toIso8601String(),
+      "returnDate": returnDate?.toIso8601String(),
+      "isReturned": isReturned,
+    };
+  }
+
+  void markReturned() {
+    this.isReturned = true;
+    this.returnDate = DateTime.now();
+    return;
+  }
+
+  bool isOverdue() {
+    if (this.isReturned) return false;
+    if (this.dueDate == null) return false;
+    return DateTime.now().isAfter(dueDate!);
+  }
+
+  int getDaysOverdue() {
+    if (!isOverdue()) return 0;
+    return DateTime.now().difference(dueDate!).inDays;
+  }
+
+  String getLoanInfo() {
+    return ' id : ${this.loanId} book id : ${this.bookId} member id : ${this.memberId} laon date :${this.loanDate} duedate : ${this.dueDate} returnData ${returnDate} isReturned : ${this.isReturned}';
+  }
+}
+
+
+// classes
+
+
+
+
+
+
+
+//  manager
+class LibraryManager {
+  Map<String, Book> _books;
+  Map<String, Member> _members;
+  List<Loan> _loans;
+  StreamController<String> _activityStream;
+  int _bookCounter;
+  int _memberCounter;
+  int _loanCounter;
+
+  LibraryManager()
+    : _books = {},
+      _members = {},
+      _loans = [],
+      _activityStream = StreamController<String>.broadcast(),
+      _bookCounter = 0,
+      _memberCounter = 0,
+      _loanCounter = 0;
+
+  Future<void> addBook(Book book) async {
+    _bookCounter++;
+    _books['BOOK$_bookCounter'] = book;
+  }
+
+  Future<Book?> findBook(String id) async {
+    try {
+      return _books.values.firstWhere((e) => e.id == id);
+    } catch (e) {
+      return null;
+    }
+  }
+
+  Future<List<Book>> getAllBooks() async {
+    List<Book> books = _books.values.toList();
+    return books;
+  }
+
+  Future<void> updateBook(String id, Book updatedBook) async {
+    Book? mybook = await findBook(id);
+    if (mybook == null) return;
+    final bok = _books.entries.firstWhere((entry) => entry.value == mybook);
+    if (bok.key.isEmpty) return;
+    _books[bok.key] = updatedBook;
+  }
+
+  Future<void> deleteBook(String id) async {
+    Book? mybook = await findBook(id);
+    if (mybook == null) return;
+    _books.removeWhere((key, value) => value == mybook);
+  }
+
+  Future<List<Book>> getAvailableBooks() async {
+    List<Book> books = await getAllBooks();
+    books = books.where((e) => e.status == BookStatus.available).toList();
+    return books;
+  }
+
+  Future<List<Book>> getBooksByGenre(String genre) async {
+    List<Book> books = await getAllBooks();
+    books = books.where((e) => e.genreTags.contains(genre)).toList();
+    return books;
+  }
+
+  Future<List<Book>> getBooksByAuthor(String author) async {
+    List<Book> books = await getAllBooks();
+    books = books.where((e) => e.author == author).toList();
+    return books;
+  }
+
+  Future<void> addMember(Member member) async {
+    _memberCounter++;
+    _members['member$_memberCounter'] = member;
+  }
+
+  Future<Member?> findMember(String id) async {
+    try {
+      return _members.values.firstWhere((e) => e.id == id);
+    } catch (e) {
+      return null;
+    }
+  }
+
+  Future<List<Member>> getAllMembers() async {
+    List<Member> members = _members.values.toList();
+    return members;
+  }
+
+  Future<void> updateMember(String id, Member updatedMember) async {
+    Member? member = await findMember(id);
+    if (member == null) return;
+    final meb = _members.entries.firstWhere((e) => e.value == member);
+    if (meb.key.isEmpty) return;
+    _members[meb.key] = updatedMember;
+  }
+
+  Future<void> deleteMember(String id) async {
+    Member? member = await findMember(id);
+    if (member == null) return;
+    _members.removeWhere((key, value) => value == member);
+  }
+
+  Future<List<Member>> getPremiumMembers() async {
+    List<Member> members = await getAllMembers();
+    members = members.where((e) => e.tier == MemberTier.premium).toList();
+    return members;
+  }
+
+  Future<List<Member>> getStandardMembers() async {
+    List<Member> members = await getAllMembers();
+    members = members.where((e) => e.tier == MemberTier.standard).toList();
+    return members;
+  }
+
+Future<void> loanBook(String bookId, String memberId) async {
+  Book? book = await findBook(bookId);
+  if (book == null) {
+    throw BookNotFoundException('Book not found $bookId');
+  }
+  Member? member = await findMember(memberId);
+  if (member == null) {
+    throw MemberNotFoundException('Member not found $memberId');
+  }
+  _validateLoan(book, member);
+  _loanCounter++;
+  String loanId = "LOAN$_loanCounter";
+  Loan loan = Loan.withDueDate(loanId, bookId, memberId);
+  _loans.add(loan);
+  book.borrow(memberId);
+  member.addToHistory(bookId);
+  _logActivity("Book $bookId loaned to $memberId");
+}
+Future<void> returnBook(String loanId) async {
+  Loan? loan = await findLoan(loanId);
+  if (loan == null) return;
+  loan.markReturned();
+  Book? book = await findBook(loan.bookId);
+  if (book != null) {
+    book.returnItem();
+  }
+  _logActivity("Loan $loanId returned");
+}
+
+  Future<void> reserveBook(String bookId, String memberId) async {
+    Book? book = await findBook(bookId);
+    if (book == null) {
+      BookNotFoundException('book not foond');
+      return;
+    }
+    if (book.status != BookStatus.available) return;
+    Member? member = await findMember(memberId);
+    if (member == null) {
+      MemberNotFoundException('member not fond');
+      return;
+    }
+  }
+
+  Future<List<Loan>> getActiveLoans() async {
+    return _loans.where((e) => !e.isReturned).toList();
+  }
+
+  Future<List<Loan>> getOverdueLoans() async {
+    return _loans.where((e) => e.isOverdue()).toList();
+  }
+
+  Future<List<Loan>> getMemberLoans(String memberId) async {
+    return _loans.where((e) => e.memberId == memberId).toList();
+  }
+
+  Future<Loan?> findLoan(String loanId) async {
+    try {
+      return _loans.firstWhere((e) => e.loanId == loanId);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  Future<List<Book>> searchCatalog(String query) async {
+    return _books.values.where((b) => b.matchesQuery(query)).toList();
+  }
+
+  Future<List<Book>> advancedSearch({
+    String? title,
+    String? author,
+    String? genre,
+  }) async {
+    return _books.values.where((b) {
+      bool match = true;
+      if (title != null) match &= b.title.contains(title);
+      if (author != null) match &= b.author.contains(author);
+      if (genre != null) match &= b.genreTags.contains(genre);
+      return match;
+    }).toList();
+  }
+
+  int getTotalBooks() {
+    return _bookCounter;
+  }
+
+  int getTotalMembers() {
+    return _memberCounter;
+  }
+
+  int getActiveLoansCount() {
+    return this._loans.length;
+  }
+
+  Map<BookStatus, int> getBookStatusDistribution() {
+    Map<BookStatus, int> result = {};
+    for (var b in _books.values) {
+      result[b.status] = (result[b.status] ?? 0) + 1;
+    }
+    return result;
+  }
+
+  Map<MemberTier, int> getMemberTierDistribution() {
+    Map<MemberTier, int> result = {};
+    for (var m in _members.values) {
+      result[m.tier] = (result[m.tier] ?? 0) + 1;
+    }
+    return result;
+  }
+
+  List<Book> getMostBorrowedBooks() {
+    return _books.values.toList();
+  }
+
+  Stream<String> get activityLog => _activityStream.stream;
+
+  void _logActivity(String message) {
+    _activityStream.add(message);
+  }
+
+  void dispose() {
+    _activityStream.close();
+  }
+
+  void _validateLoan(Book book, Member member) {
+    if (!book.isAvailable()) {
+      throw InvalidLoanException("Book not available");
+    }
+    if (!member.canBorrow()) {
+      throw InvalidLoanException("Member reached limit");
+    }
+  }
+}
+// manager
+
+
+// helpers
+String? readInput(String prompt) {
+  print(prompt);
+  return stdin.readLineSync();
+}
+
+int? readInt(String prompt) {
+  return int.tryParse(readInput(prompt) ?? '');
+}
+
+String readRequiredInput(String prompt) {
+  while (true) {
+    String input = readInput(prompt) ?? 'null';
+    if (input != 'null') {
+      return input;
+    }
+  }
+}
+
+int readRequiredInt(String prompt) {
+  while (true) {
+    int num = readInt(prompt) ?? -1;
+    if (num != -1) {
+      return num;
+    }
+  }
+}
+
+BookStatus selectBookStatus() {
+  return BookStatus.available;
+}
+
+MemberTier selectMemberTier() {
+  return MemberTier.standard;
+}
+
+bool confirm(String message) {
+  return true;
+}
+
+void printHeader(String title) {
+  print("===== $title =====");
+}
+
+void printSeparator() {
+  print("----------------------------");
+}
+
+void printSuccess(String message) {
+  print("SUCCESS: $message");
+}
+
+void printError(String message) {
+  print("ERROR: $message");
+}
+
+void printInfo(String message) {
+  print("INFO: $message");
+}
+
+void printLoanDetails(Loan loan) {
+  print(loan.getLoanInfo());
+}
+
+void printTable(List<List<String>> data, List<String> headers) {
+  print(headers.join(" | "));
+  for (var row in data) {
+    print(row.join(" | "));
+  }
+}
+
+Map<String, dynamic> bookToMap(Book book) {
+  Map<String, dynamic> c = {
+    'id': book.id,
+    'title': book.title,
+    'author': book.author,
+    'isbn': book.isbn,
+    'description': book.description,
+    'statue': book.status,
+    'genreTags': book.genreTags,
+    'currentBorrowerTd': book.currentBorrowerTd,
+    'pages': book.pages,
+    'createDat': book.createDat,
+    'updateDat': book.updateDat,
+  };
+  return c;
+}
+
+Book mapToBook(Map<String, dynamic> map) {
+  Book c = Book(map['id'] ?? '', map['title'] ?? '', map['author'] ?? '');
+  c.isbn = map['isbn'];
+  c.description = map['description'];
+  c.status = map['status'];
+  c.genreTags = map['genreTags'];
+  c.currentBorrowerTd = map['currentBorrowerTd'];
+  c.pages = map['pages'];
+  c.createDat = map['createDat'];
+  c.updateDat = map['updateDat'];
+  return c;
+}
+
+String formatDate(DateTime date) {
+  return "${date.day}/${date.month}/${date.year}";
+}
+
+String formatDuration(Duration duration) {
+  return "${duration.inDays} days";
+}
+
+List<T> filterList<T>(List<T> list, bool Function(T) test) {
+  return list.where(test).toList();
+}
+
+List<R> mapList<T, R>(List<T> list, R Function(T) mapper) {
+  return list.map(mapper).toList();
+}
+
+T reduceList<T>(List<T> list, T Function(T, T) combine) {
+  return list.reduce(combine);
+}
+
+void forEachWithIndex<T>(List<T> list, void Function(int, T) action) {
+  for (int i = 0; i < list.length; i++) {
+    action(i, list[i]);
+  }
+}
+
+bool isBookAvailable(Book book) => book.status == BookStatus.available;
+String getBookTitle(Book book) => book.title;
+int countActiveLoans(List<Loan> loans) =>
+    loans.where((l) => !l.isReturned).length;
+bool isMemberPremium(Member member) => member.tier == MemberTier.premium;
+
+
+
+
+
+
+
+
+
+
+
+// main 
+void main() async {
+  LibraryManager manager = LibraryManager();
+  bool running = true;
+
+  while (running) {
+    print("\n========= MAIN MENU =========");
+    print("1. Books");
+    print("2. Members");
+    print("3. Loans");
+    print("4. Statistics");
+    print("0. Exit");
+
+    String? choice = readInput("Choose: ");
+
+    switch (choice) {
+      // ================= BOOKS =================
+      case "1":
+        bool booksMenu = true;
+        while (booksMenu) {
+          print("\n--- BOOKS MENU ---");
+          print("1. Add Book");
+          print("2. View All Books");
+          print("3. Available Books");
+          print("4. Search");
+          print("5. Back");
+
+          String? bookChoice = readInput("Choose: ");
+
+          switch (bookChoice) {
+            case "1":
+              String id = readRequiredInput("Book ID: ");
+              String title = readRequiredInput("Title: ");
+              String author = readRequiredInput("Author: ");
+              Book book = Book(id, title, author);
+              await manager.addBook(book);
+              printSuccess("Book added.");
+              break;
+
+            case "2":
+              var books = await manager.getAllBooks();
+              books.forEach((b) => print(b.getDetails()));
+              break;
+
+            case "3":
+              var books = await manager.getAvailableBooks();
+              books.forEach((b) => print(b.getDetails()));
+              break;
+
+            case "4":
+              String query = readRequiredInput("Search: ");
+              var results = await manager.searchCatalog(query);
+              results.forEach((b) => print(b.getDetails()));
+              break;
+
+            case "5":
+              booksMenu = false;
+              break;
+
+            default:
+              printError("Invalid option.");
+          }
+        }
+        break;
+
+      // ================= MEMBERS =================
+      case "2":
+        bool membersMenu = true;
+        while (membersMenu) {
+          print("\n--- MEMBERS MENU ---");
+          print("1. Add Member");
+          print("2. View All Members");
+          print("3. View Premium Members");
+          print("4. Back");
+
+          String? memberChoice = readInput("Choose: ");
+
+          switch (memberChoice) {
+            case "1":
+              String id = readRequiredInput("Member ID: ");
+              String name = readRequiredInput("Name: ");
+              print("1.Standard  2.Premium");
+              String? tierInput = readInput("Choose tier: ");
+              MemberTier tier = tierInput == "2"
+                  ? MemberTier.premium
+                  : MemberTier.standard;
+              Member member = Member(id, name, tier);
+              await manager.addMember(member);
+              printSuccess("Member added.");
+              break;
+
+            case "2":
+              var members = await manager.getAllMembers();
+              members.forEach((m) => print(m.getMemberInfo()));
+              break;
+
+            case "3":
+              var members = await manager.getPremiumMembers();
+              members.forEach((m) => print(m.getMemberInfo()));
+              break;
+
+            case "4":
+              membersMenu = false;
+              break;
+
+            default:
+              printError("Invalid option.");
+          }
+        }
+        break;
+
+      // ================= LOANS =================
+      case "3":
+        bool loansMenu = true;
+        while (loansMenu) {
+          print("\n--- LOANS MENU ---");
+          print("1. Loan Book");
+          print("2. Return Book");
+          print("3. Active Loans");
+          print("4. Overdue Loans");
+          print("5. Back");
+
+          String? loanChoice = readInput("Choose: ");
+
+          switch (loanChoice) {
+            case "1":
+              String bookId = readRequiredInput("Book ID: ");
+              String memberId = readRequiredInput("Member ID: ");
+              try {
+                await manager.loanBook(bookId, memberId);
+                printSuccess("Book loaned.");
+              } catch (e) {
+                printError(e.toString());
+              }
+              break;
+
+            case "2":
+              String loanId = readRequiredInput("Loan ID: ");
+              await manager.returnBook(loanId);
+              printSuccess("Book returned.");
+              break;
+
+            case "3":
+              var loans = await manager.getActiveLoans();
+              loans.forEach((l) => print(l.getLoanInfo()));
+              break;
+
+            case "4":
+              var loans = await manager.getOverdueLoans();
+              loans.forEach((l) => print(l.getLoanInfo()));
+              break;
+
+            case "5":
+              loansMenu = false;
+              break;
+
+            default:
+              printError("Invalid option.");
+          }
+        }
+        break;
+
+      // ================= STATISTICS =================
+      case "4":
+        print("\n--- STATISTICS ---");
+        var bookStats = manager.getBookStatusDistribution();
+        bookStats.forEach((k, v) => print("Book $k : $v"));
+
+        var memberStats = manager.getMemberTierDistribution();
+        memberStats.forEach((k, v) => print("Member $k : $v"));
+        break;
+
+      case "0":
+        running = false;
+        print("Goodbye 👋");
+        break;
+
+      default:
+        printError("Invalid option.");
+    }
+  }
+
+  manager.dispose();
+}
diff --git a/mobile/library_management/lib/library_management.dart b/mobile/library_management/lib/library_management.dart
new file mode 100644
index 0000000..f64ad72
--- /dev/null
+++ b/mobile/library_management/lib/library_management.dart
@@ -0,0 +1,3 @@
+int calculate() {
+  return 6 * 7;
+}
diff --git a/mobile/library_management/pubspec.lock b/mobile/library_management/pubspec.lock
new file mode 100644
index 0000000..5489ca9
--- /dev/null
+++ b/mobile/library_management/pubspec.lock
@@ -0,0 +1,389 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      sha256: "796d97d925add7ffcdf5595f33a2066a6e3cee97971e6dbef09b76b7880fd760"
+      url: "https://pub.dev"
+    source: hosted
+    version: "94.0.0"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      sha256: "9c8ebb304d72c0a0c8764344627529d9503fc83d7d73e43ed727dc532f822e4b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "10.0.2"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: d0481093c50b1da8910eb0bb301626d4d8eb7284aa739614d2b394ee09e3ea04
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.7.0"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "758e6d74e971c3e5aceb4110bfd6698efc7f501675bcfe0c775459a8140750eb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.13.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  cli_config:
+    dependency: transitive
+    description:
+      name: cli_config
+      sha256: ac20a183a07002b700f0c25e61b7ee46b23c309d76ab7b7640a028f18e4d99ec
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.19.1"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
+  coverage:
+    dependency: transitive
+    description:
+      name: coverage
+      sha256: "5da775aa218eaf2151c721b16c01c7676fbfdd99cebba2bf64e8b807a28ff94d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.15.0"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      sha256: c8ea0233063ba03258fbcf2ca4d6dadfefe14f02fab57702265467a19f27fadf
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.7"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      sha256: a3b4f84adafef897088c160faf7dfffb7696046cb13ae90b508c2cbc95d3b8d4
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.1"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      sha256: f64a0333a82f30b0cca061bc3d143813a486dc086b574bfb233b7c1372427694
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.0"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      sha256: c3f1ee72c96f8f78935e18aa8cecced9ab132419e8625dc187e1c2408efc20de
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.3"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      sha256: aa6199f908078bb1c5efb8d8638d4ae191aac11b311132c3ef48ce352fb52ef8
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.2"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "178d74305e7866013777bab2c3d8726205dc5a4dd935297175b19a23a2e66571"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.2"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      sha256: dfd5a80599cf0165756e3181807ed3e77daf6dd4137caaad72d0b7931597650b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.5"
+  lints:
+    dependency: "direct dev"
+    description:
+      name: lints
+      sha256: "12f842a479589fea194fe5c5a3095abc7be0c1f2ddfa9a0e76aed1dbd26a87df"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.0"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: c8245ada5f1717ed44271ed1c26b8ce85ca3228fd2ffdb75468ab01979309d61
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: "12956d0ad8390bbcc63ca2e1469c0619946ccb52809807067a7020d57e647aa6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.18"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: "9f29b9bcc8ee287b1a31e0d01be0eae99a930dbffdaecf04b3f3d82a969f296f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.18.1"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      sha256: "41a20518f0cb1256669420fdba0cd90d21561e560ac240f26ef8322e45bb7ed6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      sha256: "6e7eac89047ab8a8d26cf16127b5ed26de65209847630400f9aefd7cd5c730db"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.2"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      sha256: f096c55ebb7deb7e384101542bfba8c52696c1b56fca2eb62827989ef2353bbc
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  path:
+    dependency: "direct main"
+    description:
+      name: path
+      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.1"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      sha256: "978783255c543aa3586a1b3c21f6e9d720eb315376a915872c61ef8b5c20177d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.2"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "5bfcf68ca79ef689f8990d1160781b4bad40a3bd5e5218ad4076ddb7f4081585"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      sha256: e7dd780a7ffb623c57850b33f43309312fc863fb6aa3d276a754bb299839ef12
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.2"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      sha256: "89f967eca29607c933ba9571d838be31d67f53f6e4ee15147d5dc2934fee1b1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      sha256: c87c3875f91262785dade62d135760c2c69cb217ac759485334c5857ad89f6e3
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.3"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      sha256: "3632775c8e90d6c9712f883e633716432a27758216dfb61bd86a8321c0580925"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.0"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      sha256: c0713a43e323c3302c2abe2a1cc89aa057a387101ebd280371d6a6c9fa68516b
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      sha256: "190222579a448b03896e0ca6eca5998fa810fda630c1d65e2f78b3f638f54812"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.13"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "56a02f1f4cd1a2d96303c0144c93bd6d909eea6bee6bf5a0e0b685edbd4c47ab"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.2"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.12.1"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: "7f554798625ea768a7518313e58f83891c7f5024f88e46e7182a4558850a4b8e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.2"
+  test:
+    dependency: "direct dev"
+    description:
+      name: test
+      sha256: "54c516bbb7cee2754d327ad4fca637f78abfc3cbcc5ace83b3eda117e42cd71a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.29.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "93167629bfc610f71560ab9312acdda4959de4df6fac7492c89ff0d3886f6636"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.9"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      sha256: "394f07d21f0f2255ec9e3989f21e54d3c7dc0e6e9dbce160e5a9c1a6be0e2943"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.15"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: "45caa6c5917fa127b5dbcfbd1fa60b14e583afdc08bfc96dda38886ca252eb60"
+      url: "https://pub.dev"
+    source: hosted
+    version: "15.0.2"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      sha256: "1398c9f081a753f9226febe8900fce8f7d0a67163334e1c94a2438339d79d635"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
+  web_socket:
+    dependency: transitive
+    description:
+      name: web_socket
+      sha256: "34d64019aa8e36bf9842ac014bb5d2f5586ca73df5e4d9bf5c936975cae6982c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.1"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      sha256: d645757fb0f4773d602444000a8131ff5d48c9e47adfe9772652dd1a4f2d45c8
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
+  webkit_inspection_protocol:
+    dependency: transitive
+    description:
+      name: webkit_inspection_protocol
+      sha256: "87d3f2333bb240704cd3f1c6b5b7acd8a10e7f0bc28c28dcf14e782014f4a572"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      sha256: b9da305ac7c39faa3f030eccd175340f968459dae4af175130b3fc47e40d76ce
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.3"
+sdks:
+  dart: ">=3.10.8 <4.0.0"
diff --git a/mobile/library_management/pubspec.yaml b/mobile/library_management/pubspec.yaml
new file mode 100644
index 0000000..4440e8c
--- /dev/null
+++ b/mobile/library_management/pubspec.yaml
@@ -0,0 +1,15 @@
+name: library_management
+description: A sample command-line application.
+version: 1.0.0
+# repository: https://github.com/my_org/my_repo
+
+environment:
+  sdk: ^3.10.8
+
+# Add regular dependencies here.
+dependencies:
+  path: ^1.9.0
+
+dev_dependencies:
+  lints: ^6.0.0
+  test: ^1.25.6
diff --git a/mobile/library_management/test/library_management_test.dart b/mobile/library_management/test/library_management_test.dart
new file mode 100644
index 0000000..b5c42ff
--- /dev/null
+++ b/mobile/library_management/test/library_management_test.dart
@@ -0,0 +1,8 @@
+import 'package:library_management/library_management.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('calculate', () {
+    expect(calculate(), 42);
+  });
+}
diff --git a/web/.gitignore b/web/.gitignore
new file mode 100644
index 0000000..c3a09b3
--- /dev/null
+++ b/web/.gitignore
@@ -0,0 +1,2 @@
+/.env
+node_modules
\ No newline at end of file
diff --git a/web/README .md b/web/README .md
new file mode 100644
index 0000000..e13884b
--- /dev/null
+++ b/web/README .md	
@@ -0,0 +1,71 @@
+# 🌤️ e · MDCopy Weather CLI App
+
+A **Node.js** command-line app that fetches real-time weather data for any city using the **OpenWeatherMap API**.
+
+---
+
+## 📁 Project Structure
+```
+project/
+├── index.js       # Main application logic
+├── .env           # Environment variables (API key) — never share this!
+├── .gitignore     # Ignores .env and node_modules
+├── package.json   # Project metadata & dependencies
+└── README.md      # You are here
+```
+
+---
+
+## ⚙️ Setup
+
+1. **Install dependencies**
+```bash
+npm install
+```
+
+2. **Get a free API key**  
+Sign up at [OpenWeatherMap](https://openweathermap.org) → My Account → API Keys
+
+3. **Create your `.env` file**
+```env
+dotenvOPENWEATHER_API_KEY=your_api_key_here
+```
+
+⚠️ **Never share your API key or push `.env` to GitHub!**
+
+---
+
+## 🚀 Usage
+```bash
+node index.js <city>
+```
+
+### Examples
+```bash
+node index.js London
+node index.js Riyadh
+node index.js "New York"
+```
+
+### Example Output
+```
+🔍 Fetching weather for "London"...
+
+ 🌍 Weather in London, GB  
+ =============================
+ 🌡️  Temperature : 18°C 
+      Feels like : 16°C  
+ 🌤️  Weather     : Clear Sky 
+ 💧  Humidity    : 60%        
+ 💨  Wind Speed  : 3.5 m/s    
+
+```
+
+---
+
+## 🧠 How It Works
+
+The app is split into **5 clean functions**:
+
+| Function             | Purpose                                           |
+- Uses **ES Modules** — requires `"type": "module"` in `package.json`
\ No newline at end of file
diff --git a/web/index.js b/web/index.js
new file mode 100644
index 0000000..4fd377c
--- /dev/null
+++ b/web/index.js
@@ -0,0 +1,74 @@
+import dotenv from 'dotenv'
+dotenv.config();
+
+const api = process.env.OPENWEATHER_API_KEY;
+const urlBas = process.env.URL_BS;
+
+function validateApiKey(){
+    if(!api){
+        console.error('API key is invalid.');
+        process.exit(1);
+    }
+}
+
+function getCity(){
+    const city = process.argv[2];
+    if(!city){
+        console.error("City is invalid.");
+        console.error('Please provide a city as a command-line argument.');
+        process.exit(1)
+    }
+    return city;
+} 
+
+async function fetchWeather(city){
+    const res = await fetch(`${urlBas}?q=${city}&appid=${api}&units=metric`);
+    const data = await res.json();
+    if(!res.ok){
+        if(res.status === 401){
+            console.error('API key is not valid.');
+        }else if(res.status === 404){
+            console.error(`city ${city} not found.`);
+        }else{
+            console.error(`Error: ${data.message || 'Unknown error'}`)
+        }
+        process.exit(1);
+    }
+    return data;
+}
+function display(data){
+    const city      = data.name;
+    const country   = data.sys.country;
+    const temp      = Math.round(data.main.temp);
+    const feelsLike = Math.round(data.main.feels_like);
+    const weather   = data.weather[0].description
+    .split(" ")
+    .map((w) => w.charAt(0).toUpperCase() + w.slice(1))
+    .join(" ");
+    const humidity  = data.main.humidity;
+    const wind      = data.wind.speed;
+    console.log(`Weather in ${city}, ${country}`);
+    console.log(`Temperature : ${temp}°C (Feels like ${feelsLike}°C)`);
+    console.log(` Weather  : ${weather}`);
+    console.log(`Humidity : ${humidity}%`);
+    console.log(`│ Wind Speed : ${wind} m/s`);
+}
+
+async function main(){
+    validateApiKey();
+    const city = getCity();
+    try{
+        console.log(` Fetching weather for ${city}`);
+        const data = await fetchWeather(city);
+        display(data);
+    }catch(e){
+    if (e.code === "ENOTFOUND") {
+        console.error("Network error: Check your internet connection.");
+    } else {
+        console.error("Something went wrong:", e.message);
+    }
+    process.exit(1);
+    }
+}
+main();
+
diff --git a/web/package-lock.json b/web/package-lock.json
new file mode 100644
index 0000000..c7013e7
--- /dev/null
+++ b/web/package-lock.json
@@ -0,0 +1,308 @@
+{
+  "name": "project1",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "project1",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "axios": "^1.13.5",
+        "dotenv": "^17.3.1"
+      }
+    },
+    "node_modules/asynckit": {
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+      "license": "MIT"
+    },
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+      "funding": [
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+    }
+  }
+}
diff --git a/web/package.json b/web/package.json
new file mode 100644
index 0000000..b9bd068
--- /dev/null
+++ b/web/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "project1",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "axios": "^1.13.5",
+    "dotenv": "^17.3.1"
+  }
+}