test String.split

test "map.mergd" do
s = :crypto.strong_rand_bytes(32)

# <<116, 101, 115, 116, 58, 0>>
# = "test:" <> <<0>>

# IO.inspect(String.slice(b, 0, 4))
c = "test:" <> s

IO.inspect(c)
dd = Base.url_encode64(c)
{:ok, he} = Base.url_decode64(dd)
IO.inspect(String.split(he, ":"))
end