fix: normalize path on windows

[Mathicha]

Fix for #60,

I tested the rust change with cargo test and the rollup plugin changes by using it locally on the playground

[kermanx]

Thank you~

[codspeed-hq]

Merging this PR will not alter performance

✅ 3 untouched benchmarks

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_{Comparing Mathicha:windows-path (2c14004) with main (67336be)}