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Subscriber

Publishers publish, and subscribers subscribe. You might also hear a few alternative terms:

Publisher = Producer = Sender
Subscriber = Consumer = Receiver

Assignment

Let's further separate the "subscribing" logic from the "distribution" logic.

Complete the doBattles function. It takes a user and an array of moves. It should return an array of pieces, Piece[], that represents the user's pieces that are in battle.

For each move, compare the moving piece's location to the location of every piece the user controls.
If a moving piece shares a location with a user's piece, a battle occurs. Add the user's piece to the result array.
The result array should:
- Follow the order of the moves array.
- Include duplicates if they occur (do not deduplicate).