(feature): Add correct multi-topic matching

Signed-off-by: SeeuSim <[email protected]>

Author: SeeuSim

backend/matching/src/lib/utils/decode-pool-ticket.ts

@@ -9,7 +9,11 @@ export const decodePoolTicket = (ticket: IStreamMessage) => {
     userId,
     socketPort,
     timestamp,
-    topic,
+    topic: topic
+      ? typeof topic === 'string'
+        ? topic.split(',').join('|') // For OR match as opposed to AND in sequence
+        : topic.join('|')
+      : undefined,
     difficulty,
   };
 };