Find nth node from last in singly linked list in one scan

Source Code: Github.

Output:

[ListNode(1),ListNode(2),ListNode(3),ListNode(4),ListNode(5),ListNode(6),ListNode(7),ListNode(8),ListNode(9),]
1st from last: ListNode(9)
2nd from last: ListNode(8)
9th from last: ListNode(1)