Make functions static and const

- Make controller helper functions static
- Make controller functions which do not modify state const

Trenser.FoodDeliveryApp/Trenser.FoodDeliveryApp/FoodDeliveryController.cpp

@@ -18,7 +18,7 @@ Date: 19-02-2026
 #include "inputHelper.h"
 #include "outputHelper.h"
 
-bool checkAccess(std::shared_ptr<User> user, const std::string& userWithAccess)
+static bool checkAccess(std::shared_ptr<User> user, const std::string& userWithAccess)
 {
 	if (!user || user->getType() != userWithAccess)
 	{
@@ -28,7 +28,7 @@ bool checkAccess(std::shared_ptr<User> user, const std::string& userWithAccess)
 	return true;
 }
 
-restaurants::iterator pickRestaurantFromRestaurants(RestaurantOwner& restaurantOwner)
+static restaurants::iterator pickRestaurantFromRestaurants(RestaurantOwner& restaurantOwner)
 {
 	util::clear();
 	int restaurantIndex = 1, restaurantChoiceIndex;
@@ -212,7 +212,7 @@ void FoodDeliveryController::registerUser()
 		}
 }
 
-void FoodDeliveryController::listRestaurants()
+void FoodDeliveryController::listRestaurants() const
 {
 	util::clear();
 	if (!checkAccess(m_authenticatedUser, "RestaurantOwner"))
@@ -258,7 +258,7 @@ void FoodDeliveryController::addNewRestaurant()
 	std::cout << "Restaurant " << restaurant->getName() << " with ID " << restaurant->getId() << " created successfully\n";
 }
 
-void FoodDeliveryController::updateRestaurantStatus()
+void FoodDeliveryController::updateRestaurantStatus() const
 {
 	try
 	{

Trenser.FoodDeliveryApp/Trenser.FoodDeliveryApp/FoodDeliveryController.h

@@ -24,9 +24,9 @@ public:
 	void run();
 	void login();
 	void registerUser();
-	void listRestaurants();
+	void listRestaurants() const;
 	void addNewRestaurant();
-	void updateRestaurantStatus();
+	void updateRestaurantStatus() const;
 	void listRestaurantOrders();
 	void markOrderReady();
 	void listMenuItems();