diff --git a/src/core/note_app.dart b/src/core/note_app.dart
index 39a3f92..03fa971 100644
--- a/src/core/note_app.dart
+++ b/src/core/note_app.dart
@@ -1,6 +1,148 @@
-class NoteApp {
-  // TODO: Complete the run function
-  void run() {
-    print('Hello, world!');
+import 'dart:io';
+
+// Define a Note class to represent individual notes
+class Note {
+  late String title;
+  late String content;
+
+  // Constructor
+  Note({
+    required this.title,
+    required this.content,
+  });
+}
+
+// Define a NotesManager class to manage notes
+class NotesManager {
+  List<Note> notes = [];
+
+  // Method to create a new note
+  void createNote() {
+    print('\nEnter note details:');
+    stdout.write('Title: ');
+    var title = stdin.readLineSync()!;
+    stdout.write('Content: ');
+    var content = stdin.readLineSync()!;
+    
+    var newNote = Note(
+      title: title,
+      content: content,
+    );
+    
+    notes.add(newNote);
+    print('\nNote created successfully!');
+  }
+
+  // Method to edit an existing note
+  void editNote() {
+    if (notes.isEmpty) {
+      print('\nNo notes available to edit.');
+      return;
+    }
+
+    stdout.write('\nEnter note title to edit: ');
+    var titleToEdit = stdin.readLineSync()!;
+    
+    var foundNote = notes.firstWhere(
+      (note) => note.title == titleToEdit,
+      orElse: () => Note(
+        title: '',
+        content: '',
+      ),
+    );
+
+    if (foundNote.title.isEmpty) {
+      print('Note with title "$titleToEdit" not found.');
+      return;
+    }
+
+    stdout.write('Enter new content: ');
+    var newContent = stdin.readLineSync()!;
+    foundNote.content = newContent;
+    print('\nNote edited successfully!');
+  }
+
+  // Method to delete a note
+  void deleteNote() {
+    if (notes.isEmpty) {
+      print('\nNo notes available to delete.');
+      return;
+    }
+
+    stdout.write('\nEnter note title to delete: ');
+    var titleToDelete = stdin.readLineSync()!;
+    notes.removeWhere((note) => note.title == titleToDelete);
+    print('\nNote deleted successfully!');
+  }
+
+  // Method to search for a note by title or content
+  void searchNote() {
+    if (notes.isEmpty) {
+      print('\nNo notes available to search.');
+      return;
+    }
+
+    stdout.write('\nEnter search term: ');
+    var searchTerm = stdin.readLineSync()!.toLowerCase();
+    var searchResults = notes.where((note) =>
+        note.title.toLowerCase().contains(searchTerm) ||
+        note.content.toLowerCase().contains(searchTerm));
+
+    if (searchResults.isEmpty) {
+      print('No matching notes found.');
+    } else {
+      print('\nSearch results:');
+      searchResults.forEach((note) {
+        print('Title: ${note.title}');
+        print('Content: ${note.content}');
+        print('----------------------');
+      });
+    }
+  }
+}
+
+// Main function to run the app
+void main() {
+  var notesManager = NotesManager();
+  var running = true;
+
+  while (running) {
+    print('\nNote Taking App');
+    print('1. Create a note');
+    print('2. Edit a note');
+    print('3. Delete a note');
+    print('4. Search for a note');
+    print('5. Exit');
+    
+    print('\n---------------------------------'); // Separator
+    
+    stdout.write('\nSelect an option: ');
+
+    var option = stdin.readLineSync();
+
+    switch (option) {
+      case '1':
+        notesManager.createNote();
+        break;
+      case '2':
+        notesManager.editNote();
+        break;
+      case '3':
+        notesManager.deleteNote();
+        break;
+      case '4':
+        notesManager.searchNote();
+        break;
+      case '5':
+        running = false;
+        break;
+      default:
+        print('\nInvalid option. Please try again.');
+        break;
+    }
+    
+    print('---------------------------------'); // Separator
   }
+
+  print('\nExiting Note Taking App...');
 }