seperated pdf-generate endpoint + added new helper in Time

Backend/helper/time_test.go

@@ -1,6 +1,7 @@
 package helper
 
 import (
+	"fmt"
 	"testing"
 	"time"
 )
@@ -35,3 +36,25 @@ func TestFormatDuration(t *testing.T) {
 		})
 	}
 }
+
+func TestGetWorkingDays(t *testing.T) {
+	testCases := []struct {
+		start string
+		end   string
+		days  int
+	}{
+		{"2025-10-01", "2025-10-02", 2},
+		{"2025-10-02", "2025-10-01", 0},
+		{"2025-10-01", "2025-10-31", 23},
+	}
+
+	for _, tc := range testCases {
+		t.Run(fmt.Sprintf("WorkingDayTest: %d days", tc.days), func(t *testing.T) {
+			startDate, _ := time.Parse(time.DateOnly, tc.start)
+			endDate, _ := time.Parse(time.DateOnly, tc.end)
+			if GetWorkingDays(startDate, endDate) != tc.days {
+				t.Error("Calculated workdays do not match target")
+			}
+		})
+	}
+}