If people want to look at some Real Deal Space Code, here's some parts I like:

CoreFlight System's executive code: https://github.com/nasa/cFE/tree/main/modules/es/fsw/src

Any code from the core of RTEMS: https://gitlab.rtems.org/rtems/rtos/rtems/-/tree/main/cpukit...

The code isn't special but it is neat and tidy, and very very clear. It says what it does, and it does something small and does it well.