input: Write a python function to retrieve the email addresses from the customer_data dictionary.
  assert get_emails(customer_data) == ['john@example.com', 'jane@example.com', 'bob@example.com']
  assert get_emails({}) == []
  assert get_emails({'004': ('Alice', 'alice@example.com', 'Paris')}) == ['alice@example.com']
output: def get_emails(customer_data):
      return [info[1] for info in customer_data.values()]