I'd say this is a very unusual setup. Normally, you give /home its own partition and then create user directories in there.

OTOH, nothing about this should break anything. What you can do if you're savvy enough:

1. Create a directory with your username in your home directory
2. Move everything in your home directory into that new one (preferably do this as root so that you're not using any files in there I guess). Careful as moving dotfiles can be tricky. find should be the correct tool here, but I can't tell you the proper command right now
3. Move /home/void next to (not into) that new directory. You should now have void and moi as the only two entries in /home/moi
4. In /etc/fstab, change the mount point for your home partition from /home/moi to /home.
5. Reboot (or remount manually)

Please, before doing this, let someone else look over this and preferably expand. I just wrote this down on my phone while on a train ride without access to a Linux machine to verify anything. Also some of these steps are not exactly beginner level.