Removing duplicate person records by last name using Stream API

It is necessary to implement the method distinctPersonByLastName, which:

• filters elements from the given list, leaving only one record for each unique last name (lastname);
• uses Stream API capabilities to perform filtering;
• saves the first encountered last name value and discards subsequent duplicates;
• returns a new list with no duplicate last names.

public List<Person> distinctPersonByLastName(List<Person> persons) {
}

@RequiredArgsConstructor
@EqualsAndHashCode
@Getter
public class Person{
  private final String firstname;
  private final String lastname;
}