fix: prevent panic from string_slice

[EdJoPaTo]

https://rust-lang.github.io/rust-clippy/master/index.html#string_slice

[codecov[bot]]

Codecov Report

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

Project coverage is 94.2%. Comparing base (cf67ed9) to head (35dee5d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1140 +/- ## ===================================== Coverage 94.2% 94.2% ===================================== Files 60 60 Lines 14630 14632 +2 ===================================== + Hits 13790 13793 +3 + Misses 840 839 -1 ```

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