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import { ListNode } from "../mod.ts";
function oddEvenList(head: ListNode | null): ListNode | null {    if (!head) return null;
    let odd: ListNode | null | undefined = head;    let even: ListNode | null | undefined = head.next;    if (!even) return head;
    const evenHead = even;    let oddlast = odd;    while (even && odd) {        // console.log(even,odd)        const nextodd: ListNode | null | undefined = odd.next?.next ?? null;
        const nexteven: ListNode | null | undefined = even.next?.next ?? null;        odd.next = nextodd;        even.next = nexteven;        if (odd) {            oddlast = odd;        }        odd = nextodd;        even = nexteven;    }    // console.log(oddlast)
    if (oddlast.next) {        oddlast.next.next = evenHead;    } else {        oddlast && (oddlast.next = evenHead);    }
    // console.log(even,odd)    // console.log(head,evenHead)    return head;}export default oddEvenList;