Fix all the incorrect comment in kotin files (#1176)

* feat(kotlin): add kotlin code for utils file.

* Update ListNode.kt

* Update PrintUtil.kt

* fix: add the header comment for linkedlist_stack class.

* fix(kotlin): fix the kotlin file name.

* delete blank line in main function

* add comment for class head.

* delete the old file.

* fix the created time

* delete blank line beneath files.

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Co-authored-by: Yudong Jin <krahets@163.com>

codes/kotlin/chapter_array_and_linkedlist/linked_list.kt

@@ -77,4 +77,4 @@ fun main() {
     /* 查找节点 */
     val index: Int = find(n0, 2)
     println("链表中值为 2 的节点的索引 = $index")
-}
+}