using System;

​

namespace Problem 

{

    internal interface IVehicle

    {

        void StartEngine();

    }

    internal class Car : IVehicle

    {

        public void StartEngine()

        {

            Console.WriteLine("Starting car");

        }

    }

    internal class Bicycle : IVehicle

    {

        public void StartEngine()

        {

            throw new NotImplementedException();

        }

    }

    internal class Mechanic

    {

        public void CheckVehicle(IVehicle vehicle)

        {

            vehicle.StartEngine();

        }

    }

}

​

namespace Solution

{

    internal interface IVehicle

    {

        void Start();

    }

    internal class Car : IVehicle

    {

        public void Start()

        {

            Console.WriteLine("Starting car");

        }

    }

    internal class Bicycle : IVehicle

    {

        public void Start()

        {

            Console.WriteLine("Pedalling Cycle");

        }

    }

    internal class Mechanic

    {

        public void CheckVehicle(IVehicle vehicle)

        {

            vehicle.Start();

        }

    }

}

public class Program

{

    public static void Main()

    {

        var bicycle = new Solution.Bicycle();

        var mechanic = new Solution.Mechanic();

        mechanic.CheckVehicle(bicycle);

        var car = new Solution.Car();

        mechanic.CheckVehicle(car);

    }

}