Propagate error messages to user

[jacklee1792]

Sometimes submitting input does not result in any output because of some error message. This should be delivered to the user

[spencerchubb]

This would require a lot of refactoring of Sebastiano's original code. He just uses printf in C to print errors

It would theoretically be possible to do, but I do not want to stray too far from the original code. If he makes changes to the original codebase, I want it to be easy to integrate with this project.

[spencerchubb]

On second thought, it may be possible to redefine printf, because I'm pretty sure C lets you redefine any syntax 😂

I might try that out