C# で複数のスペースを 1 つのスペースに置き換えるにはどうすればよいですか?

using System;
using System.Text.RegularExpressions;
namespace DemoApplication{
   class Program{
      public static void Main(){
         string stringWithMulipleSpaces = "Hello World. Hi Everyone";
         Console.WriteLine($"String with multiples spaces:
            {stringWithMulipleSpaces}");
         string stringWithSingleSpace = Regex.Replace(stringWithMulipleSpaces, @"\s+", " ");
         Console.WriteLine($"String with single space: {stringWithSingleSpace}");
         Console.ReadLine();
      }
   }
}

using System;
namespace DemoApplication{
   class Program{
      public static void Main(){
         string stringWithMulipleSpaces = "Hello World. Hi Everyone";
         Console.WriteLine($"String with multiples spaces:
         {stringWithMulipleSpaces}");
         string stringWithSingleSpace = string.Join(" ",
         stringWithMulipleSpaces.Split(new char[] { ' ' },
         StringSplitOptions.RemoveEmptyEntries));
         Console.WriteLine($"String with single space: {stringWithSingleSpace}");
         Console.ReadLine();
      }
   }
}