Update the project with Elixir's default formatting and function

[joaothallis]

The code is not following the current Elixir standards

The problems

• The code is not well formatted
• When compiling, you have a: warning: Kernel.to_char_list/1 is deprecated, use Kernel.to_charlist/1

Update the code to conform to the latest Elixir function pattern and formatting.

Motivation

Elixir Style Guide