seperated pdf-generate endpoint + added new helper in Time

Backend/helper/time.go

@@ -55,3 +55,16 @@ func FormatDurationFill(d time.Duration, fill bool) string {
 func IsSameDate(a, b time.Time) bool {
 	return a.Truncate(24 * time.Hour).Equal(b.Truncate(24 * time.Hour))
 }
+
+func GetWorkingDays(startDate, endDate time.Time) int {
+	if endDate.Before(startDate) {
+		return 0
+	}
+	var count int = 0
+	for d := startDate.Truncate(24 * time.Hour); !d.After(endDate); d = d.Add(24 * time.Hour) {
+		if !IsWeekend(d) {
+			count++
+		}
+	}
+	return count
+}