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- 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.