This actually wrong way to do it, here the pro way:
1.Start writing a game/app/engine/os.
2.Write dozen utility packages for it.
3.Write high-level packages for #2
4.Write a “light-weight” version of #3 when disgusted with bloat of #3.
5.repeat #2 with more modern rust code.
Be aware that some seaweed marketed as having B12 has pseudo-B12 that depletes B12 levels!
https://www.b12-vitamin.com/algae/