Fix: Remove trailing spaces in numberToEnglish and improve code consistency

[open-inspect-wesmith4]

Summary

This PR addresses the top issues identified in the code review:

• Fix numberToEnglish output formatting: Add .trim() to remove trailing spaces from the result string
• Update test assertions: Correct test cases to expect properly formatted output without trailing spaces
• Improve code consistency: Replace .substring() with .slice() in addCommas for cleaner, more idiomatic JavaScript

Changes

exercises/numberToEnglish/numberToEnglish.js

• Added .trim() call when joining descriptionWords to eliminate trailing spaces
• Updated 7 test cases to expect correct output format without trailing spaces

exercises/addCommas/addCommas.js

• Replaced numberString.substring(0, numberString.length - 3) with numberString.slice(0, -3) for consistency

Testing

All tests pass after changes:

• ✅ addCommas: 3/3 tests passing
• ✅ numberToEnglish: 8/8 tests passing

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