using System;

using System.Text.RegularExpressions;

​

​

public class StringSplitters

{

    public string[] SplitCamelCase(string source) 

    {

        return Regex.Split(source, @"(?<!^)(?=[A-Z])");

    }

}

​

public class Program

{

    public static void Main()

    {

        var stringSplitters = new StringSplitters();

        var split = stringSplitters.SplitCamelCase("HelloWorld");

        foreach(var s in split)

        {

            Console.WriteLine(s);

        }

    }

}