Revert a List Elixir

1_revert_list.ex

defmodule ListUtil do
  def invert([head | tail], acc) do
    invert(tail, [head | acc])
  end

  def invert([], acc) do
    acc
  end
end

defmodule Solution do
  IO.read(:all)
  |> String.split
  |> Enum.map(&String.to_integer/1)
  |> (&(ListUtil.invert(&1, []))).()
  |> Enum.each(&IO.puts/1) 

end

2_with_helper_fn.ex

defmodule ListUtil do
  def inv(list) do
    invert(list, [])
  end
  
  def invert([head | tail], acc) do
    invert(tail, [head | acc])
  end

  def invert([], acc) do
    acc
  end
end

defmodule Solution do
  IO.read(:all)
  |> String.split
  |> Enum.map(&String.to_integer/1)
  |> ListUtil.inv
  |> Enum.each(&IO.puts/1) 

end

https://www.hackerrank.com/challenges/fp-reverse-a-list/problem?isFullScreen=false

Reducing the arity of the function simplifies greatly the function call and minimeze errors.