Reuse `stt` function instead of duplicating the logic

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.83%. Comparing base (c1e2618) to head (f9cd422).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #90 +/- ## ======================================= Coverage 95.82% 95.83% ======================================= Files 19 19 Lines 599 600 +1 ======================================= + Hits 574 575 +1 Misses 25 25 ```

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