CTF challenge in c language for Windows OS

For this project, I am looking for a CTF challenge written in c language for the Windows OS with a specified difficulty level of 'Intermediate'. The challenge will be based on the PWN structure. No submission to any online CTF platform is required. In order to make it as engaging as possible, I'd like to have the challenge involve medium complexity and the challenge must be solved by send the crafted payload over network, also the type of bug I want it in the challenge a use-after-free so the player must do a heap spry to solve the challenge. The challenge should be designed with an appropriate learning curve, so players can engage with it and enjoy the experience.