如何在新的单链表中返回单链表的奇数索引节点？

class ListNode:
    def __init__(self, val=0, next=None):
        self.val = val
        self.next = next

def get_odd_index_nodes(head):
    if not head or not head.next:
        return None
    
    new_head = ListNode()
    new_tail = new_head

    curr = head
    index = 0
    while curr and curr.next:
        if index % 2 == 1:
            new_tail.next = ListNode(curr.next.val)
            new_tail = new_tail.next
        curr = curr.next
        index += 1

    return new_head.next