Chapter 4 exercises - Error Handling with Option and Either #8
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This PR introduces exercises for the Chapter 4 of the Red Book, covering error handling (specifically the implementation and uses of Option and Either). It also includes some modifications in the package structure, to isolate the types implementation used by the book so future chapters can rely on Scala's stdlib ones.
Could you please review, @juanpedromoreno @dialelo @raulraja? Thanks!