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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 method on the user type. It takes a channel that receives move structs. It should return a slice of pieces, []piece, that represents pieces in battle.

For each message in the subCh channel, compare the moving piece's location to the location of all pieces the user controls
Find and list battles. If any two pieces are in the same location, a battle occurs:
- List the user's pieces in battle in the order of the messages received
- Don't worry about deduplication