用C语言写了一个简单的通讯录，说简单一是功能简单，二是也没有加读写文件操作， 只是作为链表操作的一个练习，希望能给这方面的新手一此引导和帮助。-Use C language to write a simple address book, that simple one simple function, and second, there is no increase read and write file operations, Just as an exercise cha