text: 'use strict';
  
  var express = require('express');
  var app = express();
  var port = process.env.PORT || 7777;
  
  app.get('/cats', cats);
  app.listen(port, listening);
  
  function listening () {
    console.log('Listening on port', port);
  }
  
  function cats (req, res) {
    res.end(req.query.amount + ' paws, such purr');
  }
  