go-pkgz / stringutils / 16892768071

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Fix critical issues and improve code quality

- Replace unsafe byte-to-string conversion with safe string() conversion
- Fix DeDupBig to use map[string]struct{} for clarity and efficiency
- Handle empty string edge cases in ContainsAnySubstring
- Optimize HasCommonElement from O(n*m) to O(n+m) using map
- Add comprehensive tests for empty string edge cases
- Remove unused imports and benchmark code
- Achieve 98.9% test coverage

16 of 18 new or added lines in 1 file covered. (88.89%)

126 of 128 relevant lines covered (98.44%)

21.27 hits per line