Exercise: calculator

Port of an older exercise with reworked structure that addresses issues I've been running into with groups in past two years. The help text and a step by step solution promote the use of `?` as a default error handling option. A step by step solution also mentions Rust Analyzer commands that people new to Rust would greatly benefit from.
ferrous-systems · Feb 4, 2025 · 1b69941 · 1b69941
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diff --git a/exercise-book/src/SUMMARY.md b/exercise-book/src/SUMMARY.md
@@ -10,6 +10,7 @@
 - [Fizzbuzz with match](./fizzbuzz-match.md)
 - [Rust Latin](./rustlatin.md)
 - [URLs, match, result](./urls-match-result.md)
+- [Calculator](./calculator.md)
 - [Iterators](./iterators.md)
 - [SimpleDB](./simple-db.md)
   - [Knowledge](./simple-db-knowledge.md)