old_contents: var express = require('express');
  var router = express.Router();
  
  /* GET users listing. */
  router.get('/', function(req, res) {
    res.send('respond with a resource');
  });
  
  module.exports = router;
  
new_contents: var express = require('express')
  var router = express.Router()
  
  /* GET users listing. */
  router.get('/', function(req, res) {
    res.send('respond with a resource')
  })
  
  module.exports = router
  
subject: Update users.js