Fixed a couple of things that were causing tests to fail.#4

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DavidWhitlock wants to merge 3 commits intoProject3from

Commits on Jul 21, 2021

Fixed a couple of things that were causing tests to fail. More needs to be done, but I'll that to you to work on after you study these changes.
DavidWhitlock
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Repaired tests and fine tuned AppointmentBook's addAppointment() method
BennettDesmond
committed
Finished the Koans
BennettDesmond
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