题一：给出一个函数，原型为 int compare(char* dest,char* src)

要求比较两个字符串(由dest与src字符指针标识)

1，如果两字符串所含字母完全相同，则返回0；

2，如果两字符串所含字母相同(不区分大小写；A与a也算字母相同) ，则返回1

3，否则返回3-Topic 1: given a function prototype is int compare (char* dest, char* src) asked to compare two strings (by the character pointer dest and src logo) 1, if the two letters contained exactly the same string is returned 0　2, if two strings contain the same letters (not case-sensitive　A letter with a can be considered the same), then return to 13, 3 otherwise