LeetCode-206-反转链表
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    反转链表的题目都可以按照模板进行一些小小的修改，首先看一下模板
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    对模板修改后，得到结果

    1. public ListNode reverseList(ListNode head) {
    2.     ListNode prev = null;
    3.     ListNode curr = head;
    4.     ListNode next = null;
    6.     while(curr != null){
    7.         next = curr.next;
    8.         curr.next = prev;
    9.         prev = curr;
    10.         curr = next;
    11.     }
    13.     return prev;
    14. }