using System;

using System.Linq; 

using System.Collections.Generic;

using System.Text.RegularExpressions; 

public class Program

{

    public static void Main()

    {

         string replace = @" ";

         string pattern = @"[\t ]+";

         var text ="    En    apa  äter en  \t   banan på  \t toaletten    ";

         Console.WriteLine(text);

         text = Regex.Replace(text, pattern, replace).Trim();

         Console.WriteLine(text);

    }

}