Consolidate some Java Code to remove code duplication

I am a trainer who teaches developers how to unit test their code using xUnit. I have some Java coding exercises that I need a JavaScript version of so that I can teach the same course to JavaScript programmers. (I already have C# and C++ versions as well.) The basic goal is to have the exact same test-coding exercises available across Java, C++ C# (exist already) and JavaScript and C (these last 2 are needed) For each language, I have both System-Under-Test (SUT) code that the students don't get to see as well as the exercise code (tests, test Helpers, plus in 2 of the later exercises, a bit of system code they need to refactor). The tests can be run to ensure that the system code is behaving correctly. Some of the tests do fail deliberately so I have MetaTests that verify that the right tests are failing. But before I convert it to JavaScript, I need to consolidate some of the Java SUT code between the exercises to remove duplication so that we don't have to convert nearly as much code. There are SUT projects with largely the same classes that are mostly the same already except for package names (which can be aligned) and some extra capabilities needed in some of the later exercises. I would like to consolidate these down so that there is only one copy of each class in the SUT project. I have already done this for the C++ version of the course so that can be used as a reference while doing it for the Java. There are anywhere from 6 to 15 classes per exercise with almost complete overlap (subset) between most of them. Most of the classes are very small with the largest one running 150 lines. I also have some notes on the superflous differences between the various copies of the code. Consolidating the Java SUT code will only be the first step in multi-step job with each step being a separate assignment. If the first step works out, you will be in a good position to give me an accurate and low risk (for both of us) price for the 2nd and subsequent steps. * Step 1: Consolidate the Java SUT code and modify any tests that are impacted (which should be minimal) * Step 2: Create a JavaScript version of the consolidated Java code * Step 3: Create a C-only version of the C++ exercises. * Step 4: Repeat step 1 for the C# implementation. This project is to do Step 1. I've looked at all the code and I think I could do it in about 8 hours. As far as timelines go, I need to get Step 2 done within a couple of weeks and step 3 another week or so after that so getting Step 1 finished in a week would be preferable. All code is organized in Eclipse projects linked to GitLab repos. I have automated unit tests for each of the exercises and I have MetaTests that check that the tests in each exercise give the same result as I expect. The MetaTests will be used as the Acceptance Tests for the consolidated exercise projects. I have notes about what differs between different copies of the same classes across projects.