divide gprs pfo to several clusters

calculator/calculator.go

@@ -1,5 +1,10 @@
 // Package calculator does simple calculations.
 package calculator // Add takes two numbers and returns the result of adding them together.
+
 func Add(a, b float64) float64 {
 	return a + b
 }
+
+func Subtract(a, b float64) float64 {
+	return b - a
+}

calculator/calculator_test.go

@@ -14,3 +14,11 @@ func TestAdd(t *testing.T) {
 	}
 }
 
+func TestSubtract(t *testing.T) {
+	t.Parallel()
+	var want float64 = 2
+	got := calculator.Subtract(4, 2)
+	if want != got {
+		t.Errorf("want %f, got %f", want, got)
+	}
+}

test-vs-code/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello World")
+}