refactor(main.py, preprocess.py): move mkdir to main.py for clarity

Author: MaoSong2022

main.py

@@ -108,6 +108,8 @@ def process_one_file(file_name: str) -> None:
     try:
         # change the working directory to the main directory of the paper
         os.chdir(main_directory)
+        # create output folder
+        os.makedirs(os.path.join(main_directory, "output/result"))
 
         # step 1: preprocess the paper
         preprocess.run(original_tex)

vrdu/preprocess.py

@@ -188,7 +188,3 @@ def run(original_tex: str) -> None:
 
     # Step 3: delete table of contents
     delete_table_of_contents(original_tex)
-
-    # create output folder
-    main_directory = os.path.dirname(original_tex)
-    os.makedirs(os.path.join(main_directory, "output/result"))