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feat: add Substitution Cipher algorithm and tests#1773

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mmohamedkhaled wants to merge10 commits intoTheAlgorithms:master
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mmohamedkhaled
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Describe your change:

  • Add an algorithm

Checklist:

  • I have readCONTRIBUTING.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 use the UpperCamelCase (PascalCase) style. There are no spaces in filenames.
  • All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
  • All code is tested using Vitest and follows the ES Module syntax.
  • Code is formatted using Prettier.

Summary:

This PR adds a monoalphabetic Substitution Cipher to theciphers/ directory.

  • IncludessubstitutionCipherEncryption andsubstitutionCipherDecryption functions
  • Validates key length and character set
  • Test coverage includes:
    • Encryption
    • Decryption
    • Non-alphabetic character handling
    • Invalid key rejection
  • All tests are passing using Vitest
  • Code formatted with Prettier

📚 Reference:Wikipedia – Substitution Cipher

@codecov-commenter
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codecov-commenter commentedApr 4, 2025•
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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.91%. Comparing base(1d252d7) to head(25add22).

Additional details and impacted files
@@            Coverage Diff             @@##           master    #1773      +/-   ##==========================================+ Coverage   85.87%   85.91%   +0.04%==========================================  Files         377      378       +1       Lines       19720    19779      +59       Branches     3005     3017      +12     ==========================================+ Hits        16935    16994      +59  Misses       2785     2785

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report?Share it here.

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@mmohamedkhaled
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This PR only introduces the Substitution Cipher and its test. I’ve noticed the CI flags code style/spelling issues in files like:

String/AlphaNumericPalindrome.js

Recursive/SubsequenceRecursive.js

Maths/MobiusFunction.js

These issues are pre-existing in the repository and not introduced by this PR. I have run Prettier on my changes, and there are no further modifications I can make to fix these unrelated files.

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@raklaptudirmraklaptudirmAwaiting requested review from raklaptudirmraklaptudirm is a code owner

@appgurueuappgurueuAwaiting requested review from appgurueuappgurueu is a code owner

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