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Exercise 4.4
A variant of the unique_ptr program

The program above passes a raw pointer to a Point to the function f. It is a much better idea to wrap p (the point (1,2)) in a unique_ptr already in main, and to pass a unique_ptr to f. Provide for this change.

In addition we want to return (the ownership of) the unique_ptr in a2 back to main via a value return. Please do that.

In this exercise, please be aware that unique pointers cannot be copied - they must be moved.