add fix

.woodpecker.yml

@@ -11,6 +11,20 @@ steps:
         GOARCH: amd64
       commands:
         - go test ./...
+  go-check-version:
+    image: golang:1.24
+    commands:
+      - echo "Checking project version..."
+      - VERSION_CURRENT=$(grep 'version =' main.go | cut -d'"' -f2)
+      - PREV_COMMIT=$(git rev-parse HEAD^)
+      - VERSION_PREV=$(git show "$PREV_COMMIT:main.go" | grep 'version =' | cut -d'"' -f2)
+      - |
+        if [ "$VERSION_CURRENT" = "$VERSION_PREV" ]; then
+          echo "❌ The version has not changed. You must update it to merge to main."
+          exit 1
+        else
+          echo "✅ The version has changed correctly."
+        fi
   go-build:
     image: golang:1.24
     environment:

main.go

@@ -27,6 +27,11 @@ func main() {
 		b, _ := strconv.Atoi(r.URL.Query().Get("b"))
 		json.NewEncoder(w).Encode(map[string]int{"result": sum(a, b)})
 	})
+	mux.HandleFunc("/sub", func(w http.ResponseWriter, r *http.Request) {
+		a, _ := strconv.Atoi(r.URL.Query().Get("a"))
+		b, _ := strconv.Atoi(r.URL.Query().Get("b"))
+		json.NewEncoder(w).Encode(map[string]int{"result": sub(a, b)})
+	})
 
 	http.ListenAndServe(":8080", mux)
 }
@@ -34,3 +39,7 @@ func main() {
 func sum(a, b int) int {
 	return a + b
 }
+
+func sub(a, b int) int {
+	return a - b
+}

main_test.go

@@ -20,3 +20,20 @@ func Test_sum(t *testing.T) {
 		}
 	}
 }
+
+func Test_sub(t *testing.T) {
+	tests := []struct {
+		a, b int
+		want int
+	}{
+		{1, 2, -1},
+		{-1, 1, -2},
+		{0, 0, 0},
+	}
+
+	for _, test := range tests {
+		if got := sub(test.a, test.b); got != test.want {
+			t.Errorf("sub(%d, %d) = %d, want %d", test.a, test.b, got, test.want)
+		}
+	}
+}