public Task AmountWithdrawn(AmountWithdrawn amountWithdrawn)
{
var currentBalance = database.Select(amountWithdrawn.Number);
database.Update(amountWithdrawn.Number, currentBalance - amountWithdrawn.Amount);
return(Task.CompletedTask);
}
public void Apply(AmountWithdrawn amountWithdrawn)
{
balance -= amountWithdrawn.Amount;
}