what would u do if your friend gets credited for your work?

I'll just throw this out there as an alternative. You and the friend could go to the teacher and the friend can explain that he came up with the idea and that you helped him with some coding problems that he had/did some coding clean-up for him. Hopefully the teacher will credit both of you or then decide not to display it. Depends on the teacher, I guess.

It isn't being completely honest, but it is better than doing nothing at all.