char *mystrchr(const char *s, int c)
{
    while (*s != '\0')
    {
        if (*s == c)
            return (char *)s;
        ++s;
    }
}

int main(int argc, char **argv)
{
    char *pos;
    char string[] = "This is a test";
    pos = mystrchr(string, 'h');

    printf("%x\n", pos);

    return 0;
}