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4e9b5735ad
- file_io2: replace the manual line_number counter with .lines().enumerate(), and replace buffered_file_writer.write(format!(...).as_bytes()) with writeln!, which both formats and guarantees a complete write (write_fmt loops internally, unlike a single Write::write call). - file_io3: replace the manual match on file_path.parent() with .ok_or_else(...)? for a more idiomatic Option-to-Result conversion. Verified locally: both solutions compile under edition 2024, clippy is silent, and running them still produces identical output (3 lines processed / 117-byte file, non-readonly permissions) with no leftover files.
Official Rustlings solutions
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