Trim boundary separators in macro/snake/kebab case conversions

[Copilot]

ToMacroCase() only trimmed whitespace before non-alphanumeric normalization, so leading/trailing separators (e.g. _, -, .) were converted into boundary spaces and then emitted as leading/trailing _/-. This leaked into ToSnakeCase() and ToKebabCase() because both are derived from ToMacroCase().

• Conversion pipeline fix (ToMacroCase)

  • Normalize case-boundary splits as before, then collapse/trim the intermediate space-delimited form before converting spaces to _.
  • This removes separator artifacts at string boundaries while preserving internal word separation behavior.

• Regression coverage for boundary-separator inputs

  • Added focused tests for "_privateField-":
    • ToSnakeCase() → private_field
    • ToKebabCase() → private-field
    • ToMacroCase() → PRIVATE_FIELD

string output = input.Trim();
output = NonAlphaNumericRegex().Replace(output, " ");
output = SplitOnCaseChangeRegex().Replace(output, " ").ToUpperInvariant();
output = CollapseSpaces(output).Trim(); // new: strip boundary artifacts before "_" conversion

• Fixes Leading/trailing separator characters leak into snake_case, kebab-case, and MACRO_CASE output (e.g. _privateField → -private-field) #59

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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