Better hint

[abdtyx]

Main feature

I refactored the resolveSymbols function, now it's easier for students to understand what they need to do with errors.

Other features

By the way, I also fixed some trivial issue as well:

• Add *.out in gitignore
• The retProc in autograder is not used, so I removed it.
• Add a Makefile so that students can run make to compile and test their code.
• The shlen in util.cc is not used, removed.

[abdtyx]

Just submitted another design, any feedback? This time the students only need to return the right value and set the errSymName which is a private variable within the resolve.cc.

[abdtyx]

Add two commits