using System;

​

​

public interface ICar

{

    void StartCar();

    void StopCar();

    void WashCar();

    void ServiceCar();

}

​

public class CarWash : ICar

{

    public void StartCar()

    {

        // do nothing

    }

    public void StopCar()

    {

        // do nothing

    }

    public void WashCar()

    {

        // wash the car

    }

    public void ServiceCar()

    {

        // do nothing

    }   

}