Sorry for the shite day, does get better, and one day you’re look back and wonder what all the fuss was about, stuttering really doesn’t matter. Why not drop the prof a quick note, just say something like, with my stutter I’m not sure I clearly got my points across, if you have any coding questions, please don’t hesitate to ask, and I’ll explain and walk you through the code. PS some people are prejudging idiots, some of these are profs.