Adding a whitespace at every 5th char

WhitespaceAdder.cs

using System;
using System.Text;

namespace Sample {
  
  public class SampleClass {
    
    public static void AddWhitespace () {
      
      var InputString = "Liket hisln eedhe lpwit his";
      
      for (int i = 0; i < InputString.Length; i++) {
        
        if (i % 5 == 0) {
          //is a multiple of 5
          
          InputString.Insert(i, " ");
          
        }
        
      }
      
    }
  
  }
  
}