Empty struct unused variable

[jmattheis]

Fixes #82

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% :tada:

Comparison is base (53b9b8b) 96.98% compared to head (186f0be) 97.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #83 +/- ## ========================================== + Coverage 96.98% 97.00% +0.01% ========================================== Files 25 25 Lines 1561 1568 +7 ========================================== + Hits 1514 1521 +7 Misses 29 29 Partials 18 18 ``` | [Files Changed](https://app.codecov.io/gh/jmattheis/goverter/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jannis+Mattheis) | Coverage Δ | | |---|---|---| | [builder/struct.go](https://app.codecov.io/gh/jmattheis/goverter/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jannis+Mattheis#diff-YnVpbGRlci9zdHJ1Y3QuZ28=) | `100.00% <100.00%> (ø)` | |

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