# File lib/download_quizzes.rb, line 60
def unzip(x)
  outdir = x.sub(/.*\//, '')
  outdir = '.' if outdir == ""
  Zip::ZipFile::open(x) { |zf|
    zf.each { |e|
      fpath = File.join(outdir, e.name)
      FileUtils.mkdir_p(File.dirname(fpath))
      zf.extract(e, fpath)
    }
  }
end