input: Write a function to modify the given Python program to make a correct API request with the specified headers and parse the response to print each user's information. If the API token is not provided, raise an exception.
  
  def correct_api_request(api_token):
      if not api_token:
          raise Exception("API token is required.")
      
      import requests
  
      url = 'https://api.example.com/users'
  
      headers = {
          'Authorization': f'Bearer {api_token}',
          'Content-Type': 'application/json',
      }
  
      response = requests.get(url, headers=headers).json()
  
      for user in response['data']:
          print(user)
  
  assert correct_api_request("YOUR_API_TOKEN") == None # Expected output is None since we are only printing the users
output: def correct_api_request(api_token):
      if not api_token:
          raise Exception("API token is required.")
      
      import requests
  
      url = 'https://api.example.com/users'
  
      headers = {
          'Authorization': f'Bearer {api_token}',
          'Content-Type': 'application/json',
      }
  
      response = requests.get(url, headers=headers).json()
  
      for user in response['data']:
          print(user)