fix: topics formatting bug at composeState

Author: JhChoy

packages/core/src/runtime.ts

@@ -1509,12 +1509,12 @@ Text: ${attachment.text}
                       this.character.topics
                           .sort(() => 0.5 - Math.random())
                           .slice(0, 5)
-                          .map((topic, index) => {
-                              if (index === this.character.topics.length - 2) {
+                          .map((topic, index, array) => {
+                              if (index === array.length - 2) {
                                   return topic + " and ";
                               }
                               // if last topic, don't add a comma
-                              if (index === this.character.topics.length - 1) {
+                              if (index === array.length - 1) {
                                   return topic;
                               }
                               return topic + ", ";