I know that pin 0 i used to Serial, but I'm not receiving anything through serial, so that's why I used pin 0. But I agree with you that pin 0 is a bad pin to use 
Can you explain me little short the big reason with '\0' I could not quite understand it in your first topic, or send me a link where I can read more about it, I tried a quick Google search by my self but could not find anything that explain it good enough.
Thanks!!