Fix linting

app/Services/DatasetReader/LinearOrderDataSetReader.php

@@ -4,8 +4,10 @@ namespace App\Services\DatasetReader;
 
 use App\Services\CsvReader;
 
-class LinearOrderDataSetReader implements IDataSetReader {
+class LinearOrderDataSetReader implements IDataSetReader
+{
     public array $lines = [];
+
     private array $currentLines = [];
 
     private int $lastReadLineIndex = -1;
@@ -36,8 +38,9 @@ class LinearOrderDataSetReader implements IDataSetReader {
         }
     }
 
-    public function getNextLine(): array | null {
-        if (!isset($this->currentLines[0])) {
+    public function getNextLine(): ?array
+    {
+        if (! isset($this->currentLines[0])) {
             return null; // No more lines to read
         }