完成stack的接口标准

tree/avl/iterator.go

@@ -1,7 +1,7 @@
 package avl
 
 import (
-	"github.com/474420502/focus/lastack"
+	"github.com/474420502/focus/stack/listarraystack"
 )
 
 type Iterator struct {

tree/avldup/iterator.go

@@ -1,7 +1,7 @@
 package avldup
 
 import (
-	"github.com/474420502/focus/lastack"
+	"github.com/474420502/focus/stack/listarraystack"
 )
 
 type Iterator struct {

tree/avlkey/iterator.go

@@ -1,7 +1,7 @@
 package avlkey
 
 import (
-	"github.com/474420502/focus/lastack"
+	"github.com/474420502/focus/stack/listarraystack"
 )
 
 type Iterator struct {

tree/avlkeydup/iterator.go

@@ -1,7 +1,7 @@
 package avlkeydup
 
 import (
-	"github.com/474420502/focus/lastack"
+	"github.com/474420502/focus/stack/listarraystack"
 )
 
 type Iterator struct {

tree/vbt/iterator.go

@@ -1,7 +1,7 @@
 package vbt
 
 import (
-	"github.com/474420502/focus/lastack"
+	"github.com/474420502/focus/stack/listarraystack"
 )
 
 type Iterator struct {

tree/vbtkey/iterator.go

@@ -1,7 +1,7 @@
 package vbtkey
 
 import (
-	"github.com/474420502/focus/lastack"
+	"github.com/474420502/focus/stack/listarraystack"
 )
 
 type Iterator struct {