modify dir name : data_backup as data_source

.gitignore

@@ -7,5 +7,5 @@ __pycache__
 *.out
 helper.py
 test.md
-data_backup/dailycode
+data_source/dailycode
 test.cpp
\ No newline at end of file

it_knowledge_helper.py

@@ -177,7 +177,7 @@ def get_source_data_mapping():
                 print(solution_md_path)
                 file_mapping[file] = solution_md_path
     file_mapping_json = json.dumps(file_mapping, indent=2, ensure_ascii=False)
-    with open('data_backup/it_mapping.json', 'w', encoding='utf-8') as f:
+    with open('data_source/it_mapping.json', 'w', encoding='utf-8') as f:
         f.write(file_mapping_json)