input: Write a function to create a Flask app that fetches data from an SQL database and returns it as a JSON response when a GET request is made to the root ('/') endpoint.
  def fetch_data_and_return_json():
      import json 
      import sqlite3
      from flask import Flask, request, jsonify 
  
      app = Flask(__name__) 
        
      def dict_factory(cursor, row):
          d = {}
          for idx, col in enumerate(cursor.description):
              d[col[0]] = row[idx]
          return d 
        
      @app.route('/', methods=['GET'])
      def index(): 
          connection = sqlite3.connect('database.db')
          connection.row_factory = dict_factory
          cur = connection.cursor() 
          all_users = cur.execute('SELECT * FROM users;').fetchall() 
          return jsonify(all_users) 
        
      if __name__ == '__main__': 
          app.run(debug = True)
  
  assert fetch_data_and_return_json() == None
output: 
  def fetch_data_and_return_json():
      import json 
      import sqlite3
      from flask import Flask, request, jsonify 
  
      app = Flask(__name__) 
        
      def dict_factory(cursor, row):
          d = {}
          for idx, col in enumerate(cursor.description):
              d[col[0]] = row[idx]
          return d 
        
      @app.route('/', methods=['GET'])
      def index(): 
          connection = sqlite3.connect('database.db')
          connection.row_factory = dict_factory
          cur = connection.cursor() 
          all_users = cur.execute('SELECT * FROM users;').fetchall() 
          return jsonify(all_users) 
        
      if __name__ == '__main__': 
          app.run(debug = True)
  