using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        string test = "How now                 brown cow!";

        string test2 = string.Join(" ", test.Split(new char[0], StringSplitOptions.RemoveEmptyEntries).ToList().Select(x => x.Trim()));

        Console.WriteLine(test2);

    }

}

​

// source: https://stackoverflow.com/questions/3905180/how-to-trim-whitespace-between-characters#:~:text=How%20to%20remove%20whitespaces%20between,()%20results%20%22C%20Sharp%22%20.