Fix: correct file I/O modes, escaping logic, and main execution flow

[jigmee11]

• Swap incorrect 'w'/'r' modes in file reading and writing functions.
• Fix variable assignment bug in path_to_file_list.
• Correct boolean logic for character replacement checks.
• Fix variable overwriting in train_file_list_to_json loop.
• Update __main__ to correctly parse files before processing and call the correct functions.