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 "  one   two three four    "

 "four three two one"

 private static string reverseWords(string str) {
     string[] words = Array.FindAll<string>(str.Split(
...
         sb.Append(' ').Append(words[i]);
     return sb.ToString();
 }

 Array.Reverse(words);
 return String.Join(" ", words);

 sub reverseWords {
     join ' ', reverse split(' ', shift)
 }

 sub reverseWords(Str $s) returns Str {
     $s.words.reverse.join(' ')
 }

 def reverseWords(s)
     s.split.reverse.join(' ')
 end

 reverseWords = unwords . reverse . words