Router.js

router.js

import React from 'react'
import { Switch, Route } from 'react-router-dom'
import HelloWorld from './HelloWorld'
const Route = () => (
  <main>
    <Switch>
      <Route exact path='/hello-world/:id' component={HelloWorld}/>
      <Route path='/not-found' component={NotFound}/>
    </Switch>
  </main>
)

export default Route