Fixed worker termination and result retrieving

wwwroot/core/namecards/nameCardWorker.js

@@ -8,11 +8,11 @@ parentPort.on("message", async (data) => {
         const creator = new NameCardCreator(templatePath);
         const buffer = await creator.getWelcomeCard(avatarURL, username);
 
-        console.log(buffer);
-
         parentPort.postMessage({ result: buffer });
 
     } catch (err) {
         parentPort.postMessage({ error: err.message });
+    } finally {
+        parentPort.close();
     }
 });