def extract
      Zip::File.open(package_file) do |zip|
        zip.each do |file|
          file.extract(file.name)
        end
      end
    end
def extract
      Zip::File.open(package_file) do |zip|
        zip.each do |file|
          file.extract(file.name)
        end
      end
    end
Extract the package_file to extracted_file
 @return [bool] whether successful