input: Write a function that takes a list of email addresses as input and returns a filtered list of email addresses that belong to a particular domain. The domain to filter by is "@gmail.com".
  assert filter_emails(["john@gmail.com", "sarah@yahoo.com", "bob@microsoft.com", "sophie@gmail.com"]) == ["john@gmail.com", "sophie@gmail.com"]
  assert filter_emails(["alice@yahoo.com", "david@gmail.com", "eve@gmail.com"]) == ["david@gmail.com", "eve@gmail.com"]
  assert filter_emails(["alex@hotmail.com", "brian@outlook.com"]) == []
  assert filter_emails([]) == []
output: def filter_emails(emails):
      return [email for email in emails if "@gmail.com" in email]