diff --git a/src/rbtree2.c b/src/rbtree2.c
index 2d60e81..23d8163 100644
--- a/src/rbtree2.c
+++ b/src/rbtree2.c
@@ -1,10 +1,12 @@
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "class.h"
 #include "commons.h"
 #include "utils/memory.h"
 
 #include "tree.h"
+#include "utils/memory.h"
 
 #define NVALUES  10
 
@@ -14,54 +16,75 @@ insertCompare(const void * tval, const void * search)
     return *(const int *)tval - *(const int *)search;
 }
 
+void
+freeNode(const void * data, const int depth)
+{
+    printf("now free %d at %p\n", *(int*)data, data);
+    MEM_FREE(data);
+}
+
 void
 printNode(const void * _node, const int depth)
 {
-    //Tree node  = (Tree)_node;
-    //int  value = *(int *)node->data;
-    int  value = *(int *)_node;
+    Tree node  = (Tree)_node;
+    int  value = *(int *)node->data;
     int  i;
 
-    printf("%010d(%02d)", value, depth);
+    for (i=1; i<7; i++) i<=depth?printf("-"):printf(" ");
+    printf("%p:%d p:%p l:%p r:%p\n",
+            node, value, node->parent, node->left, node->right);
 
     // printf("%s %010d(%02d)",
     //         (node->color==rbRed)?"R":"B",
     //         value,
     //         depth);
-    for (i=0; i<depth; i++) printf("-");
-    puts("");
 }
 
 
+void *
+newEle(int value)
+{
+    void * val = memMalloc(sizeof(int));
+
+    *(int*)val = value;
+    return val;
+}
+
 /**
  * =======================================================================
  */
 int
 main(int argc, char * argv[])
 {
-    Tree  root     = NULL;
-    int * found    = NULL;
-    int   values[] = {40, 50, 60, 70, 80, 45, 75, 85};
-    int   new50    = 50;
-    int   new70    = 70;
-    int   new80    = 80;
-    int   search10 = 10;
-    int   search64 = 64;
-
-    treeInsert(&root, (void *)&(values[0]), insertCompare);
-    treeInsert(&root, (void *)&(values[1]), insertCompare);
-    treeInsert(&root, (void *)&(values[2]), insertCompare);
-    treeInsert(&root, (void *)&(values[3]), insertCompare);
-    treeInsert(&root, (void *)&(values[4]), insertCompare);
-    treeInsert(&root, (void *)&(values[5]), insertCompare);
-    treeInsert(&root, (void *)&(values[6]), insertCompare);
-    treeInsert(&root, (void *)&(values[7]), insertCompare);
+    Tree  root    = NULL;
+    int * found   = NULL;
+    int * element = NULL;
+
+    int search10 = 10;
+    int search64 = 64;
+    int search70 = 70;
+    int search80 = 80;
+    int search50 = 50;
+
+    treeInsert(&root, newEle(40), insertCompare);
+    treeInsert(&root, newEle(50), insertCompare);
+    treeInsert(&root, newEle(60), insertCompare);
+    treeInsert(&root, newEle(70), insertCompare);
+    treeInsert(&root, newEle(80), insertCompare);
+    treeInsert(&root, newEle(45), insertCompare);
+    treeInsert(&root, newEle(75), insertCompare);
+    treeInsert(&root, newEle(85), insertCompare);
     puts("traverse");
     treeWalk(root, printNode);
     puts("");
 
-    found = treeInsert(&root, (void *)&new70, insertCompare);
-    printf("insert %p(%d) got %p(%d)\n", &new70, new70, found, *found);
+    element = newEle(70);
+    found = treeInsert(&root, element, insertCompare);
+    printf("insert %p(%d) got %p(%d)\n", element, *element, found, *found);
+    if (found != element) {
+        printf("remove duplicate");
+        MEM_FREE(element);
+    }
     puts("traverse");
     treeWalk(root, printNode);
     puts("");
@@ -82,7 +105,7 @@ main(int argc, char * argv[])
     }
     puts("");
 
-    found = treeFind(root, &new70, insertCompare);
+    found = treeFind(root, &search70, insertCompare);
     if (NULL == found) {
         printf("can't find segmenet of minimum size: %d\n", 70);
     } else {
@@ -90,53 +113,62 @@ main(int argc, char * argv[])
     }
     puts("");
 
-    found = treeDelete(&root, (void *)&new70, insertCompare);
-    printf("delete %p(%d) got %p(%d)\n", &new70, new70, found, *found);
+    found = treeDelete(&root, (void *)&search70, insertCompare);
+    printf("delete %p(%d) got %p(%d)\n", &search70, search70, found, *found);
+    MEM_FREE(found);
     puts("traverse");
     treeWalk(root, printNode);
     puts("");
 
-    found = treeInsert(&root, (void *)&new80, insertCompare);
-    printf("insert %p(%d) got %p(%d)\n", &new80, new80, found, *found);
-    found = treeInsert(&root, (void *)&new50, insertCompare);
-    printf("insert %p(%d) got %p(%d)\n", &new50, new50, found, *found);
-    found = treeInsert(&root, (void *)&new80, insertCompare);
-    printf("insert %p(%d) got %p(%d)\n", &new80, new80, found, *found);
+    found = treeInsert(&root, (void *)&search80, insertCompare);
+    printf("insert %p(%d) got %p(%d)\n", &search80, search80, found, *found);
+    found = treeInsert(&root, (void *)&search50, insertCompare);
+    printf("insert %p(%d) got %p(%d)\n", &search50, search50, found, *found);
+    found = treeInsert(&root, (void *)&search80, insertCompare);
+    printf("insert %p(%d) got %p(%d)\n", &search80, search80, found, *found);
 
     puts("traverse");
     treeWalk(root, printNode);
     puts("");
 
-    found = treeDelete(&root, (void *)&new80, insertCompare);
-    printf("delete %p(%d) got %p(%d)\n", &new80, new80, found, *found);
+    found = treeDelete(&root, (void *)&search80, insertCompare);
+    printf("delete %p(%d) got %p(%d)\n", &search80, search80, found, *found);
+    MEM_FREE(found);
     puts("traverse");
     treeWalk(root, printNode);
     puts("");
 
-    found = treeDelete(&root, (void *)&new50, insertCompare);
-    printf("delete %p(%d) got %p(%d)\n", &new50, new50, found, *found);
+    found = treeDelete(&root, (void *)&search50, insertCompare);
+    printf("delete %p(%d) got %p(%d)\n", &search50, search50, found, *found);
+    MEM_FREE(found);
     puts("traverse");
     treeWalk(root, printNode);
     puts("");
 
-    found = treeDelete(&root, (void *)&new70, insertCompare);
-    printf("delete %p(%d) got %p(%d)\n", &new70, new70, found, found?*found:-1);
+    found = treeDelete(&root, (void *)&search70, insertCompare);
+    printf("delete %p(%d) got %p(%d)\n", &search70, search70, found, found?*found:-1);
+    MEM_FREE(found);
     puts("traverse");
     treeWalk(root, printNode);
     puts("");
 
-    found = treeDelete(&root, (void *)&(values[2]), insertCompare);
+    element = newEle(60);
+    found   = treeDelete(&root, element, insertCompare);
     printf("delete %p(%d) got %p(%d)\n",
-            &(values[2]),
-            values[2],
+            element,
+            *element,
             found,
             found?*found:-1);
+    if (found != element) {
+        MEM_FREE(element);
+    }
+    MEM_FREE(found);
     puts("traverse");
     treeWalk(root, printNode);
     puts("");
 
-//
-//    post(root, cleanup);
+    treeDestroy(&root, freeNode);
+    memCleanup();
 
     return 0;
 }