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Eric Coissac
e298daeef9
- **Bug fix**: Corrected logic in 4-mer calculation to properly handle sequences of length exactly three. Previously, such cases could produce invalid or unexpected results due to an incomplete guard condition (`length < 0`) which failed for ` length == 3` (where computed step size was zero). The fix ensures all sequences shorter than four bases are safely excluded. - **Refactor**: Introduced a new internal utility function (`inverser_chaine`) to centralize string reversal logic, improving code maintainability and test coverage without affecting user-facing behavior.