add shipping rules

app/Repositories/Core/DateStats.php

@@ -11,6 +11,7 @@ trait DateStats
     {
         $start = Carbon::now()->startOfMonth($prev);
         $end = Carbon::now()->endOfMonth($prev);
+
         return self::countByPeriod($start, $end);
     }
 
@@ -23,12 +24,14 @@ trait DateStats
     {
         $start = Carbon::now()->startOfMonth($prev);
         $end = Carbon::now()->endOfMonth($prev);
+
         return self::avgByPeriod($start, $end, $field);
     }
 
     public static function avgByPeriod($start, $end, $field)
     {
         $c = self::countByPeriod($start, $end);
+
         return $c ? round(self::sumByPeriod($start, $end, $field) / $c, 2) : 0;
     }
 
@@ -36,6 +39,7 @@ trait DateStats
     {
         $start = Carbon::now()->startOfMonth($prev);
         $end = Carbon::now()->endOfMonth($prev);
+
         return self::sumByPeriod($start, $end, $field);
     }