test(encode): use existing strRepeat from string utilities instead of redefining it

[Copilot]

The encode test file had a locally defined strRepeat helper that duplicated the already-exported strRepeat from src/string/repeat.

Changes

• Removed local strRepeat function definition from encode.test.ts
• Added import of strRepeat from ../../../../src/string/repeat

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[Copilot]

Pull request overview

This PR eliminates code duplication in the test suite by removing a locally-defined helper function that already exists as a well-tested utility in the library.

Changes:

• Removed the local strRepeat helper function from encode.test.ts (9 lines)
• Added import statement to use the existing strRepeat utility from src/string/repeat

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.78%. Comparing base (b2ff691) to head (15d3702).
⚠️ Report is 1 commits behind head on nev21/encode.

Additional details and impacted files

@@              Coverage Diff              @@
##           nev21/encode     #524   +/-   ##
=============================================
  Coverage         98.78%   98.78%           
=============================================
  Files               111      111           
  Lines              3384     3384           
  Branches            738      738           
=============================================
  Hits               3343     3343           
  Misses               41       41           

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