Added support for rounding of values by default in API responses

internal/adapters/inbound/httpapi/presenter/helpers.go

@@ -2,7 +2,10 @@
 // Layer: adapters/inbound/httpapi/presenter helper functions.
 package presenter
 
-import "time"
+import (
+	"math"
+	"time"
+)
 
 func celsiusToFahrenheitPtr(v *float64) *float64 {
 	if v == nil {
@@ -53,3 +56,19 @@ func boolText(v *bool) string {
 	}
 	return "false"
 }
+
+func roundedPtr(v *float64, precision int) *float64 {
+	if v == nil {
+		return nil
+	}
+	out := roundFloat(*v, precision)
+	return &out
+}
+
+func roundFloat(v float64, precision int) float64 {
+	if precision <= 0 {
+		return math.Round(v)
+	}
+	factor := math.Pow10(precision)
+	return math.Round(v*factor) / factor
+}