Josephine

`String.slice` deprecation in Elixir 1.16.0 yields warning

1

From [Elixir changelog for 1.16](https://hexdocs.pm/elixir/changelog.html#4-hard-deprecations): > 4. Hard deprecations -[String] Deprecate passing a range with negative step on [String.slice/2](https://hexdocs.pm/elixir/String.html#slice/2), give first..last//1 instead ``` @doc """ Formats the AST for a...