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- Design and implement a simple in-memory publish-subscribe system that supports the following features:
- - Multiple topics: Publishers can publish messages to named topics
- - Multiple subscribers: Subscribers can subscribe to one or more topics
- - Message delivery: When a message is published to a topic, all subscribers to that topic should receive it
- - Unsubscribe capability: Subscribers should be able to unsubscribe from topics
- - Wildcard subscriptions (bonus): Support pattern matching like "user.*" to subscribe to "user.created", "user.deleted", etc.
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