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Implement gcdex diophantine equivalently to the reference

Implement gcdex diophantine equivalently to the reference: a task in repo2rlenv-equivalence-tests (Harbor dataset). Implement the function gcdex diophantine in /workspace/task module.py so that it is behaviorally equivalent to reference gcdex diophantine (which is already provided in task…

The task

Implement the function `gcdex_diophantine` in `/workspace/task_module.py` so that it is behaviorally equivalent to `reference_gcdex_diophantine` (which is already provided in `task_module.py`).

Part of FineEnvs/repo2rlenv-equivalence-tests.