README.md

References to completing this code challenge:

1. https://ruby-doc.org/core-3.0.2/Enumerable.html#method-i-inject

2. https://stackoverflow.com/questions/698300/how-can-i-initialize-a-modules-instance-variables-in-ruby

3. https://ruby-doc.org/core-3.0.2/Enumerable.html#method-i-inject

4. https://rspec.info/

5. https://commandercoriander.net/blog/2014/11/09/a-multiline-string-cheatsheet-for-ruby/

6. http://jeromedalbert.com/ruby-how-to-iterate-the-right-way/

7. https://stackoverflow.com/questions/36963844/difference-between-and-in-ruby

8. https://stackoverflow.com/questions/32059200/convert-string-to-integer-preserving-leading-zeroes

9. https://relishapp.com/rspec/rspec-core/v/2-11/docs/helper-methods/let-and-let

10. https://stackoverflow.com/questions/26477464/describe-vs-context-in-rspec-differences

11. https://relishapp.com/rspec/rspec-core/v/3-8/docs/example-groups/basic-structure-describe-it