Implement a Smart Pointer

Implement a smart pointer.

Asked in the phone screen stage. Preceded by memory questions.

Implement the behavior through def smart_pointer(operations):. Each operation is an array:

• ["make", name, value] creates an object and its first owner.
• ["copy", new_name, existing_name] creates another owner of the same object.
• ["refs", name] records the current reference count.
• ["value", name] records the stored value.
• ["release", name] releases that owner.

Return outputs for refs and value operations in order. Inputs are valid, and an object is reclaimed when its count reaches zero.