public IHttpActionResult ReverseWords(string sentence)
 {
     try
     {
         if (string.IsNullOrEmpty(sentence))
         {
             return(Ok(string.Empty));
         }
         else
         {
             return(Ok(helpers.ReverseWords(sentence)));
         }
     }
     catch (System.Exception)
     {
         return(BadRequest("Error"));
     }
 }