Hiding messages in PNG files with Rust - Part 3

Implementation of the PNGme project suggestion. Link to original guide:

This project creates a binary together with library functions to open and edit PNGs (mostly metadata) - we won't be manipulating the pixel data in the images. This will allow users to add custom chunks with encoded messages while keeping the file structure still valid. As mentioned in the video, I'd recommend trying each section on your own, rather than trying to follow along with the video.

GitHub repo with previous implementation attempt for reference:

Part 3 handles the implementation of the Png type in our crate