class RuboCop::Cop::Style::MultilineIfModifier

def indented_body(body, node)
  body_source = "#{offset(node)}#{body.source}"
  body_source.each_line.map do |line|
    if line == "\n"
      line
    else
      line.sub(/^\s{#{offset(node).length}}/, indentation(node))
    end
  end.join
end