john-okeefe 0f8db2ab07 Add ISBN-10 to ISBN-13 validation and conversion ...

Enhance NormalizeISBN to validate and convert ISBNs:
- Validate length (10 or 13 digits), return error if invalid
- Convert ISBN-10 to ISBN-13 by prefixing '978' and recalculating checksum
- Add NormalizeISBNSafe for backward compatibility in scanners

This ensures all ISBNs stored in database are valid ISBN-13 format.

2026-02-11 09:42:18 -05:00

..

isbn_test.go

Add ISBN-10 to ISBN-13 validation and conversion

2026-02-11 09:42:18 -05:00

isbn_validation_test.go

Add ISBN-10 to ISBN-13 validation and conversion

2026-02-11 09:42:18 -05:00

isbn.go

Add ISBN-10 to ISBN-13 validation and conversion

2026-02-11 09:42:18 -05:00

tags_test.go

test: add comprehensive test suite for normalization functions

2026-02-08 11:03:50 -05:00

tags.go

feat: implement punctuation-aware tag and contributor normalization

2026-02-08 11:03:40 -05:00