reuler 0.2.0

Solutions to Project Euler in Rust
Documentation 
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<!--- The title of your PR should be short, focused, and to the point. Usually, the title is a complete sentence written as it was an order (imperative sentence) --->

## 🔍️ Description

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## 🧐 Context

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## ⚠️ Side-effects / Shortcomings

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## ✅ How this was tested ?

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## 🌱 Checklist

<!--- Add here any task left to do before the PR is ready for review / merging --->
- [ ] Perform self-review of my own code
- [ ] Comment the code, particularly in hard-to-understand areas
- [ ] Update the documentation accordingly to the new code
- [ ] Format the code
- [ ] Update existing tests / Add new tests
- [ ] Tests are passing locally