Use append for SumAll

arrays/sum.go

@@ -10,11 +10,10 @@ func Sum(numbers []int) int {
 }
 
 func SumAll(numbersToSum ...[]int) []int {
-	lengthOfNumbers := len(numbersToSum)
+	var sums []int
-	sums := make([]int, lengthOfNumbers)
 
-	for i, numbers := range numbersToSum {
+	for _, numbers := range numbersToSum {
-		sums[i] = Sum(numbers)
+		sums = append(sums, Sum(numbers))
 	}
 
 	return sums