Add .ruby-version.
Remove unnecessary conditions.
Use map instead.
Remove unnecessary conditions.
Use index method instead.
Avoid overwriting local variable.
Use regex instead.
Change method name.
.Change variable to constant
Organize blank lines.
Use %w() instead.
Join lines.
Use \s for consistency.
Remove unnecessary comments.
Add TODO comment.
Add TODO comment.
Remove unnecessary blank line.
Change regex pattern for consistency.
Use include? for readability.