old_contents: var express = require('express')
  
  var app = express()
  
  app.get('/', function (req, res) {
    res.send("Hello World")
  })
  //make redirect
  
  module.exports = app
  
new_contents: var express = require('express')
  
  var app = express()
  
  //view engine setup
  app.engine('handlebars,' exphbs({defaultLayout: 'main'}))
  app.set('view engine', 'handlebars')
  
  //route to basic server
  app.get('/', function (req, res) {
    res.send("Hello World")
  })
  
  //TO DO make redirect
  
  module.exports = app
  
subject: update app.js with view engine details