initial commit

.github/workflows/pr.yml

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+name: Pull Request
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.23'
+
+    - name: Format check
+      run: |
+        if [ "$(gofmt -s -l . | wc -l)" -gt 0 ]; then
+          echo "The following files are not formatted:"
+          gofmt -s -l .
+          exit 1
+        fi
+
+    - name: Test
+      run: go test -v ./...
+
+    - name: Build
+      run: go build -v ./...