int my_strcmp(const char *s1, const char *s2)
{
unsigned char u1, u2;
while(*s1 && (*s1 == *s2)?(s1++,s2++,1):0);
return (((u1 = *(unsigned char*)s1) < (u2 = *(unsigned char*)s2)) ? -1 : u1>u2);
}