严蔚敏版数据结构第二章线性链表的基本功能函数的C语言的实现，以及书上算法2.1，2.2，2.3的具体实现(Yan Wei Min version of data structure second chapters, the realization of C function of basic function function of linear list, and the concrete realization of algorithm 2.1, 2.2, 2.3 in book.)