feat: remove twinPrime

[vil02]

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Describe your change:

This PR removes the function twinPrime as suggested in: #1641 (comment)

This PR adds a test covering this line:

JavaScript/Maths/TwinPrime.js

Line 23 in 4a4ed57

return -1

And reorganizes existing tests.

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 83.92%. Comparing base (4a4ed57) to head (9456fd6).

Additional details and impacted files

@@ Coverage Diff @@ ## master #1641 +/- ## ========================================== - Coverage 83.94% 83.92% -0.02%  ========================================== Files 377 376 -1 Lines 19727 19698 -29 Branches 2917 2911 -6 ========================================== - Hits 16559 16532 -27  + Misses 3168 3166 -2 

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[appgurueu]

This improves coverage of the existing implementation, but I think the existing implementation has a bug: According to Wikipedia

A twin prime is a prime number that is either 2 less or 2 more than another prime number

So the (a) twin prime of 7 should be 5.

[vil02]

This improves coverage of the existing implementation, but I think the existing implementation has a bug: According to Wikipedia

A twin prime is a prime number that is either 2 less or 2 more than another prime number

So the (a) twin prime of 7 should be 5.

What should then be the twinPrime(5)?

I have to admit that I did not get this function is supposed to do. It would be more natural to have a function like isTwinPrime.

[appgurueu]

What should then be the twinPrime(5)?

I think either 3 or 7 would be fine.

We may also remove this function entirely, or replace it with an "is twin prime" variant as you suggest, IMO. It's just confusing (and trivial) as is.

[vil02]

What should then be the twinPrime(5)?

I think either 3 or 7 would be fine.

We may also remove this function entirely, or replace it with an "is twin prime" variant as you suggest, IMO. It's just confusing (and trivial) as is.

I will remove it.