Minor Refactoring for writing filter column rules

src/PhpSpreadsheet/Writer/Xlsx/AutoFilter.php

@@ -56,6 +56,20 @@ class AutoFilter extends WriterPart
             }
 
             foreach ($rules as $rule) {
+                self::writeAutoFilterColumnRule($column, $rule, $objWriter);
+            }
+
+            $objWriter->endElement();
+
+            $objWriter->endElement();
+        }
+    }
+
+    /**
+     * Write AutoFilter's filterColumn Rule.
+     */
+    private static function writeAutoFilterColumnRule(Column $column, Rule $rule, XMLWriter $objWriter): void
+    {
         if (
             ($column->getFilterType() === Column::AUTOFILTER_FILTERTYPE_FILTER) &&
             ($rule->getOperator() === Rule::AUTOFILTER_COLUMN_RULE_EQUAL) &&
@@ -108,10 +122,4 @@ class AutoFilter extends WriterPart
             $objWriter->endElement();
         }
     }
-
-            $objWriter->endElement();
-
-            $objWriter->endElement();
-        }
-    }
 }