Given a list of integers, swap the first and last elements in the list. Return the modified list. The list will always have at least one element.
For example:
swapEnds([1, 2, 3, 4]) → [4, 2, 3, 1]swapEnds([1, 2, 3]) → [3, 2, 1]swapEnds([8, 6, 7, 9, 5]) → [5, 6, 7, 9, 8]swapEnds([10]) → [10]swapEnds([2, 4]) → [4, 2]