Extract logic into Task

lib/mihainator/csv_parser.ex

@@ -0,0 +1,9 @@
+defmodule Mihainator.CSVParser do
+  @moduledoc false
+
+  def start(file) do
+    File.stream!(file)
+    |> Stream.map(&String.split(&1, ","))
+    |> Enum.count()
+  end
+end