void Shift( char *s ){

    char s1[3] = {*s, *(s+1), *(s+2)};
	int i, j;

	for(i=3; *(s+i); i++)					
	{
		*(s+(i-3)) = *(s+i);
	}
	for(j=i-3,i=0; i<3; i++)
	{
		*(s+(j++)) = s1[i];
	}
    
}