input: Write a python function to store email addresses in a CSV file.
  assert store_emails(["example@gmail.com","example2@gmail.com","example3@gmail.com"]) is None
  assert open('emails.csv').read().strip() == 'example@gmail.com\nexample2@gmail.com\nexample3@gmail.com'
  assert store_emails(["test1@example.com", "test2@example.com"]) is None
  assert open('emails.csv').read().strip() == 'test1@example.com\ntest2@example.com'
output: def store_emails(email_list):
      import csv
  
      with open('emails.csv', mode='w', newline='') as file:
          writer = csv.writer(file)
          for email in email_list:
              writer.writerow([email])