add create_file func

[Sergey-Sobka]

No description provided.

[mateacademy-ai-mentor]

Review Summary

I am approving your solution because it correctly implements all the required functionality: argument parsing for -d and -f, nested directory creation, interactive content input with the exact "Enter content line: " prompt, timestamped and numbered blocks, and proper appending behavior when the file already exists. The file is created in the correct location depending on whether -d is provided, and the content format (timestamp, numbered lines, blank line between blocks) matches the specification. Your use of os.path.join and os.makedirs satisfies the cross‑platform and directory-creation requirements, and the logic is cleanly separated into helper functions, which improves readability and maintainability.

One minor point to be aware of: you are using modern type annotations like list[str] and str | None, which require Python 3.9/3.10 or newer; if this needs to run on older Python versions, you would switch to from typing import List, Optional and use List[str] and Optional[str] instead. As an optional improvement, you could also add a short README or usage comment explaining the flags, expected Python version, and example invocations, but this is not required for correctness. Overall, this is a solid, requirement-compliant implementation—well done.

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