eg:given nums = [0, 1, 0, 3, 12], nums should be [1,3, 12, 0, 0].
public void moveZeroes(int[] nums) {
int index = 0;
for (int i = 0; i < nums.length; i++) {
if (nums[i] != 0) {
nums[index++] = nums[i];
}
}
for (int i = index; i < nums.length; i++) {
nums[i] = 0;
}
}
