C++ Project create/add class to project similar to exe example

Hello Freelancer, I am working on a C++ project. The project has already most of the code however, it needs a class implemented in the project. The class is already in the code however, the actual class is missing. A new class will need to be created/added to a header file that will work with the current code. I will provide a EXE file that works exactly as the project should work. The new class will need to work exactly like how it works in the EXE file. The project is not too long and will needs to be completed by today, the lastest by tomorrow. The project is technically already completed however I need a class implemented. What I need is somebody that can write a class from the current code. The class will need to be on a header file. This project needs to be completed by tomorrow.