add 238 solution #13

	name: Go Test & Coverage

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v5

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version-file: go.mod # 用 go.mod 里声明的 Go 版本(1.19)，与题解代码年代匹配

	- name: Run tests with coverage # 复用仓库原有的 gotest.sh，生成 coverage.txt
	run: bash ./gotest.sh

	- name: Show coverage gaps # 在日志里打印总覆盖率 + 所有未达 100% 的函数，方便定位
	if: always()
	run: \|
	echo "===== TOTAL ====="
	go tool cover -func=coverage.txt \| tail -n 1
	echo "===== functions below 100% ====="
	go tool cover -func=coverage.txt \| grep -v '100.0%' \|\| true

	- name: Upload coverage profile # 把 coverage.txt 作为构建产物，可在 run 页面 Artifacts 下载后发我
	if: always()
	uses: actions/upload-artifact@v4
	with:
	name: coverage-profile
	path: coverage.txt

	- name: Upload coverage to Codecov
	uses: codecov/codecov-action@v4
	with:
	token: ${{ secrets.CODECOV_TOKEN }} # 需在仓库 Settings → Secrets and variables → Actions 里添加（从 codecov.io 获取）
	files: ./coverage.txt
	verbose: true # 输出详细日志，方便核对 codecov 实际解析到的覆盖率
	fail_ci_if_error: false # codecov 上传出问题时不让整个 CI 变红，构建徽章只反映测试本身

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