The result is not binary - you can have it fully working, or forget binary protocol, or syntax accepted but multiplication not happening; or correct code change

The result is not binary - you can have it fully working, or forget binary protocol, or syntax accepted but multiplication not happening; or correct code changes done, but code does not build... That is one of advantages of longer questions (compared to 5 minute one): even if task is not fully done, there are plenty of other signals.