Add a field to the BankAccount class named transactionFee for

a real number representing an amount of money to deduct every time the user withdraws money. The default value is $$0\mathrm{.}00,$ but the client can change the value. Deduct the transaction fee money during every withdraw call $($but not

from deposits$).$ Make sure that the balance cannot go negative during a withdrawal. If the withdrawal $($amount plus transaction fee$)$ would cause it to become negative, don$$t modify the balance at all.