Implement gray to bin equivalently to the reference
Implement gray to bin equivalently to the reference: a task in repo2rlenv-equivalence-tests (Harbor dataset). Implement the function gray to bin in /workspace/task module.py so that it is behaviorally equivalent to reference gray to bin (which is already provided in task module.py ).
The task
Implement the function `gray_to_bin` in `/workspace/task_module.py` so that it is behaviorally equivalent to `reference_gray_to_bin` (which is already provided in `task_module.py`).