Given a list, rotate the values clockwise by one (the last value is sent to the first position).
Check the examples for a better understanding.
rotate_by_one([1, 2, 3, 4, 5]) ➞ [5, 1, 2, 3, 4]
rotate_by_one([6, 5, 8, 9, 7]) ➞ [7, 6, 5, 8, 9]
rotate_by_one([20, 15, 26, 8, 4]) ➞ [4, 20, 15, 26, 8]
All lists are the same size, so it's not necessary to use loops or to think much about complex solutions.