public IActionResult Post([FromBody] Comment comment)
 {
     try
     {
         if (_commentManager.Validate(comment))
         {
             _commentManager.Save(comment);
         }
         return(Ok());
     }
     catch (PostNotFound e)
     {
         return(BadRequest(e.Data));
     }
     catch (AuthorNotFound e)
     {
         return(BadRequest(e.Data));
     }
 }