void swap(char *s1,char *s2)
{
    char tmp = *s1;
    *s1 = *s2;
    *s2 = tmp;
}

void reverseString(char* s, int sSize){
    int left = 0;
    int right = sSize-1;
    while(left<right)
    {
        swap(&s[left++],&s[right--]);
    }
    return s;
}