refactor: currency lib files

[maxwellmattryan]

Summary

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...

Changelog

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Relevant Issues

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Closes #5056

Testing

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• Desktop
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Instructions

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Test general app functionality.

Checklist

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• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or modified tests that prove my changes work as intended
• I have verified that new and existing unit tests pass locally with my changes
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• I have made corresponding changes to the documentation

[jeeanribeiro]

LGTM! 🚀