Exercise: reversed slice

Write a function func reversed(nums []int) []int that returns a new slice with the elements of nums in reverse order. The function does not change the slice nums itself.

• reversed([]int{1, 2, 3}) → [3 2 1]
• reversed([]int{5}) → [5]
• reversed([]int{}) → []

Constraints: nums holds from 0 to 1000 elements; for an empty slice the result is empty; after the call, nums holds the same elements in the same order.

Do not add extra imports unless the task says so explicitly.