using System;

using System.Collections.Generic;

​

class Program

{

    static void Main(string[] args)

    {

        var robots = new List<Robot>{new Robot()};

        foreach (var robot in robots)

        {

            robot.Walk();

            // Business Requirement 1: A robot should be able to fight

            // robot.Fight();

        }

​

        Console.WriteLine("Press any key to continue");

        Console.ReadLine();

    }

}

​

public class Robot

{

    public void Walk()

    {

        Console.WriteLine("I'm walking");

    }

}