Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

The Kotlin code generator is not sanitizing enum values correctly. This occurs for hyphenated values where it gets translated to Minus.

This was previously addressed in Issue #9683 and partially fixed in PR #16267 (since it does not cover enum values). The fix should be quick to address but let me know if you need me to submit a PR for this

openapi-generator version

Version 7.13.0

OpenAPI declaration file content or url

Any OpenAPI file that contains an enum whose value contains an hyphen:

properties:
  propertyName:
    type: string
    default: HYPHENATED-VALUE
    enum:
      - HYPHENATED-VALUE

Steps to reproduce

1. Go to AbstractKotlinCodegenTest.java
2. Add an assertion for any enum type. Example: assertEquals(codegen.toEnumVarName("long-Name", null), "longName");
3. Run the test
4. Verify that it fails. It should be longName instead of longMinusName

Related issues/PRs

Similar to Issue #9683 and partially fixed in PR #16267

Suggest a fix

Replace line modified = value; with modified = sanitizeName(value, "\\W-[\\$]"); in AbstractKotlinCodegen.java
Add unit tests for the different enum properties. Example:

1. original -> long-Name becomes longMinusName
2. snake_case -> long-Name becomes long_name
3. camelCase -> long-Name becomes longName
4. PascalCase -> long-Name becomes LongName
5. UPPERCASE -> long-Name becomes LONG_NAME