input: Write a function to modify the given Python program to correctly make an API request using appropriate headers and parse the response to print each user's data. If the response is successful and contains user data, it should print each user's information, otherwise, it should return None.
  
  def make_api_request(url, api_token):
      headers = {
          'Authorization': f'Bearer {api_token}',
          'Content-Type': 'application/json',
      }
      
      response = requests.get(url, headers=headers).json()
      
      if 'data' in response:
          for user in response['data']:
              print(user)
          return True
      else:
          return None
  
  assert make_api_request('https://api.example.com/users', 'YOUR_API_TOKEN') == True
  assert make_api_request('https://api.example.com/nonexistent', 'YOUR_API_TOKEN') is None
output: def make_api_request(url, api_token):
      headers = {
          'Authorization': f'Bearer {api_token}',
          'Content-Type': 'application/json',
      }
      
      response = requests.get(url, headers=headers).json()
      
      if 'data' in response:
          for user in response['data']:
              print(user)
          return True
      else:
          return None