refactor: export code wrapper in modify-config

[tobySolutions]

Please describe the changes this PR makes and why it should be merged:

Status

• [ ] Code changes have been tested against prettier, or there are no code changes
• [x] I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• [x] This PR changes the codebase
  • [x] This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
  • [ ] This PR changes the internal workings with no modifications to the external API (bug fixes, performance improvements)
• [ ] This PR only includes non-code changes, like changes to documentation, README, etc.

I abstracted the return logic for writing into the config file in all cases into helper functions

[vercel[bot]]

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[coveralls]

Pull Request Test Coverage Report for Build 7356004425

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 25.706%

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Totals
Change from base Build 7314175169:	0.0%
Covered Lines:	1257
Relevant Lines:	5082

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💛 - Coveralls

[tobySolutions]

@Drex72 reviewed this. Thanks Drex.