Update app.py

Fixing code - to avoid matches in any segment.

app.py

@@ -79,7 +79,7 @@ def get_titles(topic_content_code:str = '',
     alldb = requests.get(url)
     dict_result = {}
     for i in alldb.json():
-        if topic_content_code in i['path']:
+        if topic_content_code == i['path'].split('/')[-1]:
             dict_result[i['title']] = [j for j in i['path'].split('/') if j]+[i['id']]
     return dict_result