class RuboCop::Cop::EmptyLineCorrector

def correct(corrector, node)
  offense_style, range = node
  case offense_style
  when :no_empty_lines
    corrector.remove(range)
  when :empty_lines
    corrector.insert_before(range, "\n")
  end
end

def insert_before(corrector, node)
  corrector.insert_before(node, "\n")
end