chore: covert stack class challenge into lab

freeCodeCamp / CurriculumExpansion

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Closed Dario-DC closed 2 months ago

Dario-DC commented 2 months ago

Checklist:

[x] I have read freeCodeCamp's contribution guidelines.
[x] My pull request has a descriptive title (not a vague title like Update index.md)

Closes #471