Day 5

lib/common.ex

@@ -33,5 +33,9 @@ defmodule Aoc2023.Common do
 
   def id(x), do: x
   def const(_, x), do: x
+
   def lines(x), do: String.split(x, "\n")
+
+  def head([head | _]), do: head
+  def tail([_ | tail]), do: tail
 end