Cleanup and reformat using Ruff

app.py

@@ -1,17 +1,14 @@
 import os
-import streamlit as st
 
-from apikey import llm_api_key
+import streamlit as st
+from langchain.chains import ConversationalRetrievalChain
 from langchain.chat_models import ChatOpenAI
-from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain.document_loaders import Docx2txtLoader, PyPDFLoader, TextLoader
 from langchain.embeddings.openai import OpenAIEmbeddings
+from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.vectorstores.chroma import Chroma
-from langchain.chains import ConversationalRetrievalChain
-from langchain.document_loaders import (
-    PyPDFLoader,
-    Docx2txtLoader,
-    TextLoader,
-)
+
+from apikey import llm_api_key
 
 key = llm_api_key
 
@@ -152,3 +149,4 @@ def clear_history():
 
 if __name__ == "__main__":
     main()
+    main()