参考回答：
char* str_reverse(char* str){int n = strlen(str) / 2;int i = 0;char tmp = 0;for(i = 0; i < n; i++){tmp = str[i];str[i] = str[strlen(str)-i-1];str[strlen(str)-i-1] = tmp;}return str;}
参考回答：
char* str_reverse(char* str){int n = strlen(str) / 2;int i = 0;char tmp = 0;for(i = 0; i < n; i++){tmp = str[i];str[i] = str[strlen(str)-i-1];str[strlen(str)-i-1] = tmp;}return str;}
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