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

Which was exactly my point, tell the friend to take it off the museum, but dont make him fail because you did something for him without his asking, you were just doing something for a friend, you deserve some consequence too. The friend does not deserve credit for it, and it should not go in the museum.

As Quantact said, if he does the rest of his work by himself then fine, but dont let it go to the museum. As a friend you should help your friends when they're in trouble, but doing the assignment for them doesn't help at all.

Though I still disagree with the term thief, thats a matter of your own personal moral agenda.