profile dependencies added

lib/view_models/auth_view_model.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import '../core/utils/result.dart';
 import '../data/repositories/auth_repository.dart';
 import '../data/services/model/login_response/login_response_model.dart';
+import '../data/services/model/logout_response/logout_response.dart';
 import '../data/services/model/user/user.dart';
 
 class AuthViewModel with ChangeNotifier {
@@ -70,6 +71,26 @@ class AuthViewModel with ChangeNotifier {
     notifyListeners();
   }
 
+  Future<void> logout() async {
+    _errorMessage = null;
+    notifyListeners();
+
+    final result = await _authRepository.logout();
+
+    switch (result) {
+      case Ok<LogoutResponse>():
+        _loggedInUser = null;
+        break;
+      case Error<LogoutResponse>():
+        _errorMessage = result.error.toString();
+        break;
+    }
+
+    notifyListeners();
+    _errorMessage = null;
+    notifyListeners();
+  }
+
   @override
   void dispose() {
     usernameController.dispose();