Refactor: remove unwrap() in /src/model/ phase2 and phase3

[jakeheke75]

Reference issue #227

Thanks,
Gianmario

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/model/utils.rs	50.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/error/chains.rs	61.40% <100.00%> (+2.14%)	⬆️
src/model/utils.rs	91.17% <50.00%> (+13.17%)	⬆️

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