Add my own work for exercises 1-10#4

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mark-allott wants to merge 18 commits intoYorkCodeDojo:mainfrom

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Commits on Aug 18, 2025

Make constructors private: instances shall be created using the Nil and Cons methods
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Updated to match requirements for Exercise 2
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Commits on Aug 20, 2025

Commits on Sep 2, 2025

updated gitignore
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