unsigned char my_and(unsigned char x, unsigned char y)
{
  return (x & y);
}

unsigned char my_C_or(unsigned char x, unsigned char y)
{
  return (x | y);
}

unsigned char my_xor(unsigned char x, unsigned char y)
{
  return (x ^ y);
}

// link name which starts with a capital letter
unsigned char MyAnd(unsigned char x, unsigned char y)
{
  return (x & y);
}