using System;
using System.Text;
 
public class Test
{
  private static string UndupSpc(string s)
  {
    var sb = new StringBuilder(s.Length);
    int i = 1;
 
    sb.Append(s[0]);
 
    for (int q=1; q<s.Length; ++q)
      if (s[q] != ' ' || s[q-1] != ' ')
        sb.Append(s[q]);
 
    return sb.ToString();
  }
 
  public static void Main()
  {
    var s = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed    do eiusmod tempor incididunt ut  labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco      laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in    reprehenderit in voluptate  velit esse cillum dolore eu fugiat nulla    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est  laborum.";
 
    Console.WriteLine(UndupSpc(s));
  }
}

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