Initial implementation

[codecov[bot]]

Codecov Report

Patch coverage: 97.56% and project coverage change: +0.03 :tada:

Comparison is base (cef6736) 90.66% compared to head (d7fb3f0) 90.70%.

:exclamation: Current head d7fb3f0 differs from pull request most recent head c4b4474. Consider uploading reports for the commit c4b4474 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #151 +/- ## ========================================== + Coverage 90.66% 90.70% +0.03% ========================================== Files 52 53 +1 Lines 6342 6380 +38 ========================================== + Hits 5750 5787 +37 - Misses 592 593 +1 ``` | [Impacted Files](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/151?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2) | Coverage Δ | | |---|---|---| | [R/sub.R](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/151?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-Ui9zdWIuUg==) | `89.18% <ø> (-0.82%)` | :arrow_down: | | [R/advan5.R](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/151?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-Ui9hZHZhbjUuUg==) | `96.66% <96.66%> (ø)` | | | [R/nonmem2rx.R](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/151?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-Ui9ub25tZW0ycnguUg==) | `85.54% <100.00%> (+0.11%)` | :arrow_up: | | [src/abbrev.c](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/151?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-c3JjL2FiYnJldi5j) | `96.96% <100.00%> (+<0.01%)` | :arrow_up: | | [src/util.cpp](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/151?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-c3JjL3V0aWwuY3Bw) | `92.53% <100.00%> (+0.12%)` | :arrow_up: |

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