If you would like to contribute, check the github issues. Please take any of the tasks you want, but please also comment on the issue so I know you're working on it.
The code is formated through uncrustify. It's not perfect but it works 90% of the time so I use it. In order to make it simple for me I use the script found here. You only need to make sure you're one directory above polvora when you do.