`IdentifierNaming` rule `VARIABLE_HAS_PREFIX` does not check for keywords

[HaukeRa]

Describe the bug

This inspection removes a single letter prefix (e.g. mFunction --> function). It does not check if the resulting property/variable name is a keyword (e.g. kClass --> class) which generates invalid code which further inspections will trip over and fail with an exception.

Expected behavior

The inspection generates valid code (imho not renaming affected properties) if the renaming would result in a language keyword.

Observed behavior

com.pinterest.ktlint.core.ParseException: 17:8 Expecting property name or receiver type on a subsequent inspection because it fails to parse the code.

Steps to Reproduce

Environment information

• diktat version: 1.1.0
• build tool (gradle): 7.4.2
• how is diktat run (CLI, plugin, etc.): spotless
• kotlin version: 1.6.20
• operating system: windows/ubuntu

[orchestr7]

Thank you for the report! That should be easy to fix :)