public ResponseModel <IEnumerable <PhoneBookOutputModel> > GetAll()
 {
     try
     {
         _logger.LogInformation("Fetching phonebook list.");
         var phonebooks = _phoneBookService.GetPhonebooks();
         return(phonebooks);
     }
     catch (Exception exception)
     {
         _logger.LogInformation($"An exception occurred: {exception.ToString()}");
         return(new ResponseModel <IEnumerable <PhoneBookOutputModel> >
         {
             ResponseMessage = "An unexpected error occcurred",
             IsSuccessful = false
         });
     }
 }