Update app.py

app.py

@@ -414,7 +414,7 @@ async def join(websocket, key):
         )
         project_name = []
         async for line in process.stdout:
-            project_name.append(line)
+            project_name.append(line.strip().decode('utf-8'))
 
         return_code = await process.wait()
         base_path = os.path.join(os.getcwd(), 'projects', key,project_name[0])