chore: remove unnecessary Option as return value

[cakebaker]

This PR changes the return value of a private function from Option<Offset> to just Offset because the function never returns None.

[yuankunzhang]

@sylvestre this one too.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (6499842) to head (6feeddf).
⚠️ Report is 31 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #179   +/-   ##
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