class RuboCop::Cop::Style::FormatString

def on_send(node)
  formatter(node) do |selector|
    detected_style = selector == :% ? :percent : selector
    return if detected_style == style
    add_offense(node.loc.selector, message: message(detected_style)) do |corrector|
      autocorrect(corrector, node)
    end
  end
end