堆栈的实现代码，实现了栈的所有功能，PUSH，POP，插入，销毁，清空等，有调试程序，可以很清楚的看到栈的运行过程-Realize stack code, realize all the features of the stack, PUSH, POP, insertion, destruction, empty and so on, have a debugger, you can clearly see the operation of the process stack