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代码说明：

  实现带头结点的单向链表的创建、删除链表、插入结点等操作，并能实现年龄递增的两个单向链表合并一个链表，合并后的链表按年龄递减，可认为同名同年龄是同一个学生，每个学生在合并后的链表中仅出现一次。最后打印输出合并后的链表元素，验证结果的正确性(Take the lead node singly linked list to create, delete linked list, insert node operation, and age of increasing two-way linked list merge a linked list, combined linked list decreasing by age, with the same name in the same age a student, each student appears only once in the combined list. The final printout list elements after the merger, the correctness of the verification results)