public IActionResult DeleteElement(int elementId)
 {
     try
     {
         var deleteElement = _context.Items.Find(elementId);
         if (deleteElement == null)
         {
             throw new Exception("You try to delete not existing element.");
         }
         _context.Remove(deleteElement);
         return(Ok());
     }
     catch (Exception ex)
     {
         return(StatusCode(StatusCodes.Status500InternalServerError, ex.Message));
     }
 }