[LeetCode] Remove Nth Node From End of List

public class Solution {
    public ListNode removeNthFromEnd(ListNode head, int n) {
        ListNode firstTraveling = head;
        ListNode lastTraveling = head;
        
        for (int i=0; i<n; i++) {
            firstTraveling = firstTraveling.next;
        }
        
        if (firstTraveling==null)
            return head.next;
        
        while (firstTraveling.next != null) {
            firstTraveling = firstTraveling.next;
            lastTraveling = lastTraveling.next;
        }
        
        lastTraveling.next = lastTraveling.next.next;
        
        return head;
    }
}