Add project files.

CarManagerV2/StateManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CarManagerV2
+{
+    internal class StateManager
+    {
+
+        static List<Car> cars = new List<Car>();
+
+        public static Car getCarById(int id)
+        {
+            cars = SafeManager.readCars("cars.csv");
+            return cars.FirstOrDefault(c => c.Id == id);
+        }
+
+        public static List<Car> Cars { get { return cars; } set { cars = value; } }
+
+        public static void addCar(Car car)
+        {
+            cars = SafeManager.readCars("cars.csv");
+            cars.Add(car);
+            SafeManager.saveCars("cars.csv", cars);
+        }
+
+        public static void removeCar(Car car)
+        {
+            cars = SafeManager.readCars("cars.csv");
+            Console.WriteLine(cars);
+            cars.Remove(car);
+            Console.WriteLine(cars);
+            SafeManager.saveCars("cars.csv", cars);
+        }
+
+        public static void updateCar(Car car)
+        {
+            Car existingCar = getCarById(car.Id);
+            if (existingCar != null)
+            {
+                cars.Remove(existingCar);
+                cars.Add(car);
+            }
+        }
+
+        public static void createCar(string make, string model, int year, string color, int mileage, decimal price)
+        {
+            cars = SafeManager.readCars("cars.csv");
+            int newId = cars.Count > 0 ? cars.Max(c => c.Id) + 1 : 1;
+            Car newCar = new Car(newId, make, model, year, color, mileage, price);
+            cars.Add(newCar);
+        }
+    }
+}