simple compression mathod to code itself?

i not code at all in recent years
(recently i coded half of my compuler with a plan to write second half
but its to ambitious to lazy coding mood i got recently)
but recently i started this slamm coding modd and found
ite pleasurable
searching for lazy side things i could code in such mood
i thought maybe i wopuld like to have compression routine
but i would like to write it myself sortla like i use quicksort
or so but i also want to write it myself
so is there maybe some method i could use i mean some simple
routine that compresses and uncompresses an array of bytes but
maybe something a bit more complex than RLE (rune length encoding)
- only thing i know from this domain