How would you write the accepted answer of https://stackoverflow.com/questions/19293481/how-to-elegantly-interleave-two-lists-of-uneven-length-in-python in Elixir?
More specifically, this code
from itertools import groupby
len_ab = len(a) + len(b)
groups = groupby(((a[len(a)*i//len_ab], b[len(b)*i//len_ab]) for i in range(len_ab)),
key=lambda x:x[0])
[j[i] for k,g in groups for i,j in enumerate(g)]
