moving string.js to more code coverage

[jaredwray]

Please check if the PR fulfills these requirements

• [x] Followed the Contributing guidelines.
• [x] Tests for the changes have been added (for bug fixes/features) without decreasing code coverage.
• [x] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) moving string.js to more code coverage

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.03% :tada:

Comparison is base (cb2ed9b) 96.65% compared to head (8a41d6d) 97.69%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #14 +/- ## ========================================== + Coverage 96.65% 97.69% +1.03% ========================================== Files 26 26 Lines 4425 4425 ========================================== + Hits 4277 4323 +46 + Misses 148 102 -46 ``` | [Files Changed](https://app.codecov.io/gh/jaredwray/fumanchu/pull/14?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jared+Wray) | Coverage Δ | | |---|---|---| | [lib/string.js](https://app.codecov.io/gh/jaredwray/fumanchu/pull/14?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jared+Wray#diff-bGliL3N0cmluZy5qcw==) | `100.00% <100.00%> (+5.98%)` | :arrow_up: |

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