Mack did some plumbing work in Nick's home.He did not have a license to do plumbing and therefore his contract was unenforceable under state law.Mack assigned his claim against Nick to Bill, who was a licensed plumber.Bill sued Nick for the amount due for Mack's work.Nick asserted the defense that the contract was unenforceable because of the lack of a license.Will this defense be good against Bill, the assignee?Explain.