using System;

public class Program

{

    public static void Main()

    {

        Func<string, string> handler1 = (s) => {

            s = s.ToUpper();

            return s;

        };

        Func<string, string> handler2 = (s) => {

            s = s.TrimStart();

            return s;

        };

        Func<string, string> handler3 = (s) => {

            s = s.TrimEnd(',');

            return s;

        };

        Func<string, string> chain = ChainBuilder(ChainBuilder(handler1, handler2), handler3);

        Console.WriteLine(chain("    hello,"));

    }

    static Func<Func<string, string>, Func<string, string>, Func<string, string>> ChainBuilder = (f1, f2) => s => {

        s = f1(s);

        if (f2 != null) {

            s = f2(s);

        }

        return s;

    };

}