using System;

​

namespace Ninja 

{

​

    public static class Program

    {

        //https://stackoverflow.com/questions/6219454/efficient-way-to-remove-all-whitespace-from-string

        public static string RemoveWhitespace(this string str)

        {

            return string.Join(" ", str.Split(default(string[]), StringSplitOptions.RemoveEmptyEntries));

        }

        public static void Main()

        {

            var strWithSpace = "hello   i \n 222 \t tab me \n !. Cow \r\n moooo";

            var strNoWhiteSpace = System.Text.RegularExpressions.Regex.Replace(strWithSpace, @"\s+", " ");

            Console.WriteLine($"Original string: {strWithSpace}" );

            Console.WriteLine();

            Console.WriteLine($"Use Regex: {strNoWhiteSpace}" );

            Console.WriteLine();

            Console.WriteLine($"Use Extension: {strWithSpace.RemoveWhitespace()}" );

            Console.WriteLine();

            Console.WriteLine($"Use Replace: {strWithSpace.Replace(" ","")}" );

        }

    }

}