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Kivanc Gunalp 68f8369cb4 Harden file_io exercises: remove magic number, dedupe paths

- file_io3: replace the hardcoded expected file size (117) with
  SAMPLE_TEXT.len(), so the check is derived from the actual content
  instead of an unexplained magic number.
- file_io3: use create_dir_all instead of create_dir, and add a
  sample_file_path() helper shared by main/create_required_files/
  file_cleanup to avoid three separate ad-hoc path constructions.
- file_io1/file_io2: hoist the sample text into a SAMPLE_TEXT constant
  used by both the exercise and its solution, removing duplicated
  literals.

No behavioral change: all three solutions were rebuilt and run
locally, producing identical output (file size still 117, permissions
still non-readonly) with no leftover files.

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

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Harden file_io exercises: remove magic number, dedupe paths

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