public void AddEngine(ICar1 car)
 {
     if (car is BMWCar)
     {
         BMWCar BMWCar = (BMWCar)car;
         BMWCar.Engine = "Petrol Engine";
         Console.WriteLine("PetrolCarDecorator added Petrol Engine to the Car : " + car);
     }
 }
        public static void Start()
        {
            Console.WriteLine("Hello World!");
            ICar1 bmwCar1 = new BMWCar();

            bmwCar1.ManufactureCar();
            Console.WriteLine(bmwCar1 + "\n");
            ICar1 bmwCar2 = new BMWCar();
            PetrolCarDecorator carWithPetrolEngine = new PetrolCarDecorator(bmwCar2);

            carWithPetrolEngine.ManufactureCar();
            Console.ReadLine();
        }