[BUG][go-server] Repeated letters like GGG are generated like Ggg

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Generating repeated letters like GGG, are sometimes (this time, specifically in enum) generated as Ggg which should same model name and method name
more in detail, please see below↓

Actual result
in reference repo (see below (Shift+g)), function AssertGggScopeEnumRequired in generated/go/model_ggg_scope_enum.go has its Ggg characters,
but function line:29 AssertGGGScopeEnumRequired in generated/go/model_patch_users_user_id_request.go has its GGG, which is all uppercase.

Expected result
I expect they have same function name like AssertGggScopeEnumRequired

Note: that we can use oneOf instead of using allOf, but it make them completely different name so I might like to use allOf for this time. anyOf also generate similar (or same?) function name as like oneOf do.

openapi-generator version

We are using v6.0.1 - in docker

OpenAPI declaration file content or url

It's long, so I'd paste gist here:
https://gist.github.com/rikusen0335/afe53b2c9b16dee83103199a2808fdea

Generation Details

• golang 1.20 (in local. docker image uses 1.10)
• go-server
• configs:
  • only featureCORS: true

Steps to reproduce

version: '3.5'

services:
  api:
    image: openapitools/openapi-generator-cli:v6.0.1
    volumes:
      - .:/work
    working_dir: /work
    command: >
      sh -c '
        rm -rf /work/generated/*
        docker-entrypoint.sh generate \
        --generator-name go-server \
        --input-spec /work/test.yaml \
        --config /work/config.yaml \
        --output /work/generated \
        --additional-properties enumClassPrefix=true
      '

1. Just copy and run above as docker compose

Related issues/PRs

No issues found if didn't I miss something

Suggest a fix

Other models like GGGDeveloper in model is named as GggDeveloper, so it might be name like GggScopeEnum.

Reference

This repo might help and won't waste your time:
https://github.com/rikusen0335/reproduce-openapi-goserver-repeted-letters-bug/blob/main/test.yaml

Start with the linked test.yaml and config.yaml, then run the provided Docker Compose go-server generation command. Compare generated/go/model_ggg_scope_enum.go with generated/go/model_patch_users_user_id_request.go, focusing on AssertGggScopeEnumRequired versus AssertGGGScopeEnumRequired. Done means the repeated-letter name is generated consistently as AssertGggScopeEnumRequired.