public static void Main()
var nums = new int[] {1,2,3,4,5,6,7};
public static void Rotate(int[] nums, int k) {
int lastIndex = nums.Length - 1;
for (int r = 1; r <= 3; r++)
int lastValue = nums[lastIndex];
for(int i = 0; i < nums.Length; i++)
Console.WriteLine(nums[i]);