feat: remove duplicated gcd-like functions

[vil02]

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Describe your change:

This PR removes the duplicated implementation of recursive gcd and moves an iterative one to Maths.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
• All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
  Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.07%. Comparing base (0204198) to head (71057b1).

Additional details and impacted files

@@ Coverage Diff @@## master #1642 +/- ## ========================================== + Coverage 83.92% 84.07% +0.14%  ========================================== Files 376 375 -1 Lines 19698 19688 -10 Branches 2910 2914 +4 ========================================== + Hits 16532 16552 +20 + Misses 3166 3136 -30 

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