Palindrome Rearranging

Elixir Palindrome Rearranging

defmodule PalindromeRearranging do
  def palindrome_rearranging(input_string) do
    input_string
    |> String.graphemes()
    |> Enum.frequencies()
    |> Map.values()
    |> Enum.count(&(rem(&1, 2) != 0))
    |> Kernel.<=(1)
  end
end

This counts character frequency and checks whether the string has the right number of odd counts to form a palindrome.