diff --git a/bintree.c b/bintree.c
index 02be37d..c62d2d7 100644
--- a/bintree.c
+++ b/bintree.c
@@ -1,24 +1,20 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-
 #include "stack.h"
 #include "bintree.h"
 
 static StackNode *push_left(TreeNode *node, StackNode *stack);
 
-/* Vergleichsfunktion */
-int compareFct(const void *argument1, const void *argument2)
+int compareFct(const void *a, const void *b)
 {
-    int x = *((int *)argument1);
-    int y = *((int *)argument2);
-
+    int x = *((int *)a);
+    int y = *((int *)b);
     if (x < y) return -1;
     if (x > y) return 1;
     return 0;
 }
 
-/* Erzeugt einen neuen Baumknoten mit Datenkopie */
 static TreeNode *create_node(const void *data, size_t data_size)
 {
     TreeNode *node = malloc(sizeof(TreeNode));
@@ -27,7 +23,6 @@ static TreeNode *create_node(const void *data, size_t data_size)
         perror("Speicher wurde NICHT reserviert!");
         return NULL;
     }
-
     node->data = malloc(data_size);
     if (!node->data)
     {
@@ -35,67 +30,48 @@ static TreeNode *create_node(const void *data, size_t data_size)
         free(node);
         return NULL;
     }
-
     memcpy(node->data, data, data_size);
     node->left = NULL;
     node->right = NULL;
-
     return node;
 }
 
-/* Fügt Daten in den Binärbaum ein */
 TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize,
                     CompareFctType compareFct, int *isDuplicate)
 {
     if (root == NULL)
     {
-        if (isDuplicate)
-            *isDuplicate = 0;
+        if (isDuplicate) *isDuplicate = 0;
         return create_node(data, dataSize);
     }
-
     int cmp = compareFct(data, root->data);
-
     if (cmp < 0)
-    {
         root->left = addToTree(root->left, data, dataSize, compareFct, isDuplicate);
-    }
     else if (cmp > 0)
-    {
         root->right = addToTree(root->right, data, dataSize, compareFct, isDuplicate);
-    }
-    else
-    {
-        if (isDuplicate)
-            *isDuplicate = 1;
-    }
-
+    else if (isDuplicate)
+        *isDuplicate = 1;
     return root;
 }
 
-/* Inorder-Iterator über den Baum */
-void *nextTreeData(TreeNode *root)
+// nextTreeData benutzt jetzt einen extern verwalteten Stack
+void *nextTreeData(TreeNode *root, StackNode **stack)
 {
-    static StackNode *stack = NULL;
-
-    /* Neuer Start → linken Pfad auf Stack legen */
     if (root != NULL)
-        stack = push_left(root, stack);
+        *stack = push_left(root, *stack);
 
-    if (stack == NULL)
+    if (*stack == NULL)
         return NULL;
 
-    /* TOP lesen, dann POP */
-    TreeNode *node = (TreeNode *)top(stack);
-    stack = pop(stack);
+    TreeNode *node = (TreeNode *)top(*stack);
+    *stack = pop(*stack);
 
     if (node->right != NULL)
-        stack = push_left(node->right, stack);
+        *stack = push_left(node->right, *stack);
 
     return node->data;
 }
 
-/* Hilfsfunktion: linken Pfad auf Stack legen */
 static StackNode *push_left(TreeNode *node, StackNode *stack)
 {
     while (node != NULL)
@@ -106,23 +82,19 @@ static StackNode *push_left(TreeNode *node, StackNode *stack)
     return stack;
 }
 
-/* Gibt gesamten Baum frei */
 void clearTree(TreeNode *root)
 {
     if (root == NULL)
         return;
-
     clearTree(root->left);
     clearTree(root->right);
     free(root->data);
     free(root);
 }
 
-/* Liefert Anzahl der Knoten */
 unsigned int treeSize(const TreeNode *root)
 {
     if (root == NULL)
         return 0;
-
     return 1 + treeSize(root->left) + treeSize(root->right);
 }
\ No newline at end of file
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diff --git a/main.o b/main.o
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