用C++链表实现一个电话簿功能，包括通过缩写查找联系人，通过电话查找联系人，通过邮编查找联系人，找到最年轻联系人，添加联系人-Linked with C++ to implement a phone book functions, including search by abbreviation contacts, find contacts by telephone, by Zip code to find contacts, to find the youngest contacts, adding contacts