Given a day of the week encoded as 0=Sun, 1=Mon, 2=Tue, ...6=Sat, and a boolean indicating if we are on vacation,
return a String
of the form "7:00" indicating when the alarm clock should ring.
Weekdays, the alarm should be "7:00" and on the weekend it should be "10:00".
Unless we are on vacation.
Then on weekdays it should be "10:00" and weekends it should be "off".
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