fix: modify fail 🔀

Author: m9rco

package/Sort/QuickSort.php

@@ -12,11 +12,13 @@
  * 递归地（recursive）把小于基准值元素的子数列和大于基准值元素的子数列排序
  *
  * @param  array $container
- * @return array|void
+ * @return mixed
  */
 function QulickSort( array $container ){
     $count = count( $container );
-    if( $count <= 1 ) return;
+    if( $count <= 1 ) {
+        return $container;
+    }
     $left = $right = [];
     for ( $i =0; $i<$count-1;$i++ ){
         if( $container[$i] < $container[0] ){
@@ -26,7 +28,7 @@ function QulickSort( array $container ){
         }
     }
     $left = QulickSort($left); $right = QulickSort($right);
-    return array_merge($left,[$container[0],$right]);
+    return array_merge($left,[$container[0]],$right);
 }
 
 var_dump( QulickSort([4,21,41,2,53,1,213,31,21,423]) );