using System;

public class Program

{

    public static void Main()

    {

        //var printer = new Action<string, string>(Printer);

        Action<string, string> printer;

        printer = Printer;

        printer += Printer;

        printer += PrinterExtended;

        PrintWithPrinter("Hello World!", "down", printer);

    }

    public static void PrintWithPrinter(string message, string ind, Action<string,string> printer)

    {

        printer(message, ind);

    }

    static void Printer(string message, string method)

        {

        switch (method)

        {

            case "down":

                Console.WriteLine(message.ToLower());

                break;

            case "up":

                Console.WriteLine(message.ToUpper());

                break;

            case "reversed":

                Console.WriteLine(reverse(message));

                break;

            default:

                Console.WriteLine(message);

                break;

        }

    }

        static void PrinterExtended(string message, string method)

        {

        switch (method)

        {

            case "down":

                Console.WriteLine(message.ToLower() + " extension message");

                break;

            case "up":

                Console.WriteLine(message.ToUpper() + " extension message");

                break;

            case "reversed":

                Console.WriteLine(reverse(message) + " extension message");

                break;

            default:

                Console.WriteLine(message + " extension message");

                break;

        }

    }

    static string reverse(string message) 

    {

        string temp = string.Empty;

        for(int i = message.Length -1; i >=0; i--)

            temp += message[i];

        return temp;

    }

}