check message for one level only

src/index.ts

@@ -141,6 +141,7 @@ export default class HisoutensokuJammerPlugin implements OnApply {
     let messageMatch = receivedMessage.match(matcherGlobal);
     if (useCache) {
       const lastMessage = await this.cache.get('lastMessages', sender);
+      const currentMessage = receivedMessage;
       if (lastMessage) {
         receivedMessage = `${lastMessage} ${receivedMessage}`;
         if (!messageMatch) {
@@ -148,7 +149,7 @@ export default class HisoutensokuJammerPlugin implements OnApply {
         }
       }
       if (!messageMatch) {
-        await this.cache.set('lastMessages', sender, receivedMessage);
+        await this.cache.set('lastMessages', sender, currentMessage);
         return;
       }
       await this.cache.del('lastMessages', sender);