public async Task <IActionResult> PutBills(int id, ExpenseService.DataAccess.Model.Bills bills)
        {
            if (id != bills.Id)
            {
                return(BadRequest());
            }

            var newBill = Mapper.MapBills(bills);

            _repo.Changed(newBill);

            try
            {
                await _repo.SaveAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!(await BillsExists(id)))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(NoContent());
        }