input: Write a function to reverse the order of days in a timetable and print each day.
  assert reverse_timetable(["Tuesday", "Wednesday", "Thursday", "Friday"]) == ["Friday", "Thursday", "Wednesday", "Tuesday"]
  assert reverse_timetable(["Monday", "Tuesday", "Wednesday"]) == ["Wednesday", "Tuesday", "Monday"]
  assert reverse_timetable(["Saturday", "Sunday"]) == ["Sunday", "Saturday"]
output: def reverse_timetable(timetable):
      return timetable[::-1]