--- a/pkg/common/round.go	Mon Sep 09 17:39:57 2019 +0200
+++ b/pkg/common/round.go	Mon Sep 09 18:07:10 2019 +0200
@@ -19,49 +19,48 @@
 	"time"
 )
 
-type Rest struct {
-	Key  int
-	Rest float64
-}
+// SumPreservingRound rounds the values of arr preserving the sum.
+func SumPreservingRound(arr []float64) []int {
 
-// Simple sum preserving rounding method:
-func SumPreservingRound(arr []float64) []int {
+	type rest struct {
+		key  int
+		rest float64
+	}
+
 	var (
-		sum   float64
-		rests []Rest
+		result = make([]int, len(arr))
+		rests  = make([]rest, len(arr))
+		sum    float64
+		newSum int
 	)
-	result := make([]int, len(arr))
 
 	// floor all values
 	for i, v := range arr {
 		sum += v
 		result[i] = int(v)
-		rests = append(rests, Rest{Key: i, Rest: v - float64(result[i])})
+		newSum += int(v)
+		rests[i] = rest{key: i, rest: v - float64(result[i])}
 	}
 
-	// find the difference in summs
-	var newSum int
-	for _, v := range result {
-		newSum += v
-	}
-	delta := int(math.Round(sum)) - newSum
-
 	// spread delta over values with highest rest
 	sort.Slice(rests, func(i, j int) bool {
-		return rests[i].Rest > rests[j].Rest
+		return rests[i].rest > rests[j].rest
 	})
+
+	// find the difference in sums
+	delta := int(math.Round(sum)) - newSum
 	for _, v := range rests {
 		if delta <= 0 {
 			break
 		}
-		result[v.Key]++
+		result[v.key]++
 		delta--
 	}
 
 	return result
 }
 
-// Round anarray of Duratons to full days
+// RoundToFullDays rounds durations to full days.
 func RoundToFullDays(durations []time.Duration) []int {
 	days := make([]float64, len(durations))
 	for i, v := range durations {