public async Task <ActionResult <IEnumerable <BookOrderDto> > > GetAllApprovedBookOrders()
        {
            try
            {
                var bookOrders = await _bookOrderService.GetAllApprovedBookOrders();

                if (bookOrders.Count() != 0)
                {
                    return(Ok(bookOrders));
                }
                return(NoContent());
            }
            catch (Exception ex)
            {
                return(BadRequest(ex.Message));
            }
        }