class RubyXL::MyZip

def unzip(zipPath,zipDirPath)
  Zip::ZipFile.open(zipPath) { |zip_file|
    zip_file.each { |f|
      fpath = File.join(zipDirPath, f.name)
      FileUtils.mkdir_p(File.dirname(fpath))
      zip_file.extract(f, fpath) unless File.exist?(fpath)
    }
  }
end