using System;

public class Program

{

    public static void Main()

    {

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

            s = s.ToUpper();

            if (next != null) {

                s = next(s);

            }

            return next(s);

        };

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

            s = s.TrimStart();

            return s;

        };

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

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

    }

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

        s = f1(s, f2);

        return s;

    };

}