Kivanc Gunalp 4e9b5735ad Use more idiomatic Rust in file_io2/file_io3 ...

- 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.

2026-07-26 15:48:35 +00:00

..

file_io1.rs

Harden file_io exercises: remove magic number, dedupe paths

2026-07-26 15:27:53 +00:00

file_io2.rs

Use more idiomatic Rust in file_io2/file_io3

2026-07-26 15:48:35 +00:00

file_io3.rs

Use more idiomatic Rust in file_io2/file_io3

2026-07-26 15:48:35 +00:00