procedure so that it creates password-protected accounts. That is,
should take a symbol as an additional argument, as in
(define acc (make-account 100 'secret-password))
The resulting account object should process a request only if it is accompanied by the password with which the account was created, and should otherwise return a complaint:
((acc 'secret-password 'withdraw) 40) 60 ((acc 'some-other-password 'deposit) 50) "Incorrect password"
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