It was quite easy as I knew instantly how I wantet to solve it, and of course I’m getting more used to Erlang, so I don’t have to look up everything. I really like Erlang so far 
I’m not experienced with Elixir, I just did some small hobby projects with Phoenix, and already it’s easier for me to read/write Erlang, just because of the time i spent with it.
I solved todays one by changing one instruction, test the code, then changing next instruction and test again, so quite brute force. No idea for some other solution.
Code’ll follow, wanna do some clean up first