input: 
  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)
  
  
  What is the purpose of the `dict_factory` function in the above code, and how is it utilized within the `index` function to achieve its goal?
output:     
      connection.close()
  