Fix successor duration

app/Models/VersionGantt.php

@@ -4,6 +4,7 @@ namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
 use App\Models\Activity;
+use App\Models\Link;
 use DateTime;
 
 class VersionGantt extends Model
@@ -47,9 +48,13 @@ class VersionGantt extends Model
       }
       $activities = Activity::where('version_gantt_id', $this->id)->get();
       foreach ($activities as $value) {
+        $exist = Link::where('t_activity_id', $value->id)->exists();
         $startDate = new DateTime($value->start_date);
         $endDate = new DateTime($value->end_date);
         $duration = $endDate->diff($startDate)->days + 1;
+        if ($exist) {
+          $duration--;
+        }
 
         // Iterate through each day and subtract the days off
         for ($i = 0; $i < $duration; $i++) {