public IHttpActionResult AddAuthor(String fullName)
 {
     try
     {
         repository.AddAuthor(fullName);
         return(Ok());
     }
     catch (Exception exception)
     {
         return(BadRequest(exception.Message));
     }
 }
 public IHttpActionResult AddAuthor(String fullName)
 {
     repository.AddAuthor(fullName);
     return(Ok());
 }