[3pts] Group task #2 - Add all methods visible in the diagram

[Claudia P. R. Soto]

• Add all methods visible in the diagram

• Implement methods:

  • can_be_archived?() in the Item class

    • should return true if published_date is older than 10 years

    • Otherwise, it should return false

  • move_to_archive() in the Item class

    • Should reuse can_be_archived?() method

    • Should change the archived property to true if the result of the can_be_archived?() method is true

    • Should do nothing if the result of the can_be_archived?() method is false