Urgently Need a Java developer to modify an existing small project on library management

I am looking for an independent Java developer who can modify an existing Java based application. The application is library management system and is already complete. However the entire code needs to be changed as it will be used for another client and the codes should be completely different. The developer only needs to modify the code and need not make the entire application from scratch as its already done. Just need to change the code completely so that it looks completely different from the source one. The codes will be checked for similarity and the newly written code should not match with the old code by more than 5%. Else payment will not be made.

Only serious bidders are invited to bid and the bidder should be a full time freelancer developer, not working in any company either part time or full time. As the project is time bound and needed in next 3 days.