مولّد مخطط استدعاءات Go

package billing

func Run() int {
	total := SumInvoices(fetchInvoices())
	report(total)
	return total
}

func fetchInvoices() []int {
	return []int{1000, 2500, 400}
}

func SumInvoices(amounts []int) int {
	total := 0
	for _, amount := range amounts {
		total += amount
	}
	return total
}

func report(total int) {
	println(total)
}