BassyKuo

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char* reverse (char* str) {
    int len = strlen (str);
    if (len < 1) return 0;
    int tmp = *(str);
    *str = *(str + (len-1) * sizeof(char));
    *(str + (len-1) * sizeof(char)) = '\0';