old_contents: import React, { Component } from 'react';
  import logo from './logo.svg';
  import './App.css';
  
  
  import App from './1-props';
  // import App from './0-hello-world';
  
  class Root extends Component {
    render() {
      return (
        <div className="App">
          <App />
        </div>
      );
    }
  }
  
  export default Root;
  
new_contents: import React, { Component } from 'react';
  import './App.css';
  
  
  import App from './1-props';
  // import App from './0-hello-world';
  
  class Root extends Component {
    render() {
      return (
        <div className="App">
          <App />
        </div>
      );
    }
  }
  
  export default Root;
  
subject: comment out logo