Just let them know what you said here, and send your revised code to them. Nothing to lose. I was in a similar scenario before(C programming exam and no C exper

Just let them know what you said here, and send your revised code to them. Nothing to lose. I was in a similar scenario before(C programming exam and no C experience for the previous ~5 years) with a large networking company and they were gracious and accepted my re-do as showing my enthusiasm.