public IActionResult GetOrdersBySellerId(int sellerId)
        {
            var isValidUser = _usersRepository.GetUserById(sellerId);
            var isSeller    = _usersRepository.CheckIfUserIsSeller(sellerId);

            if (isValidUser == null)
            {
                return(NotFound("Not a real user, my dude"));
            }
            else if (isSeller == null)
            {
                return(NotFound("That user doesn't sell anything, mon frère"));
            }
            else
            {
                var orders           = _ordersRepository.GetOrdersBySeller(sellerId);
                var thereAreNoOrders = !orders.Any();
                if (thereAreNoOrders)
                {
                    return(NotFound("Keine zutreffende Bestellungen, Alter"));
                }
                return(Ok(orders));
            }
        }