Script exit with no output

---

Traceback (most recent call last):
  File "/usr/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "./src/main.py", line 55, in <module>
    run()
  File "./src/main.py", line 44, in run
    tasks_functions[task](source_dir, output_dir, print_to_stdout)
  File "./src/task5.py", line 76, in run_top_task
    task4.unpack_html_files(source_dir, output_dir, print_to_stdout)
AttributeError: module 'src.task4' has no attribute 'unpack_html_files'