Refactor: move service logic out of api routes and into separate files

src/services/BeerComment/findBeerCommentById.ts

@@ -0,0 +1,11 @@
+import DBClient from '@/prisma/DBClient';
+
+const findBeerCommentById = async (id: string) => {
+  const comment = await DBClient.instance.beerComment.findUnique({
+    where: { id },
+  });
+
+  return comment;
+};
+
+export default findBeerCommentById;