shiftRight([9, 7, 5, 3]) → [3, 9, 7, 5]
 shiftRight([7, 5, 3]) → [3, 7, 5]
 shiftRight([1, 2]) → [2, 1]
 shiftRight([1]) → [1]*/


/*int* right_shift (int *arr, int len) {
    int *out = new int[len];
    for (int i = len - 1; i >= 1; i --)
        out[i] = arr[i - 1];
    out[0] = arr[len - 1];

    return out;
}