feat(certificate): Implement adding up

handlers/certificate.go

@@ -47,7 +47,7 @@ func GenerateCertificate(c *fiber.Ctx) error {
 	}
 
 	genConfig := &models.CertificateTemplateOptions{
-		Runners:        certificateRequest.Runners,
+		Runners:        addUpRunnerDonations(certificateRequest.Runners),
 		EventName:      "Event name",
 		Footer:         "Footer",
 		CurrencySymbol: "€",
@@ -71,3 +71,13 @@ func GenerateCertificate(c *fiber.Ctx) error {
 	c.Set(fiber.HeaderContentType, "application/pdf")
 	return c.Send(pdf)
 }
+
+func addUpRunnerDonations(runners []models.RunnerWithDonations) []models.RunnerWithDonations {
+	for i := 0; i < len(runners); i++ {
+		for j := 0; j < len(runners[i].DistanceDonations); j++ {
+			runners[i].TotalDonations += runners[i].DistanceDonations[j].Amount
+			runners[i].TotalPerDistance += runners[i].DistanceDonations[j].AmountPerDistance
+		}
+	}
+	return runners
+}