diff --git a/bintree.c b/bintree.c
index 1e34db0..d5d86ca 100644
--- a/bintree.c
+++ b/bintree.c
@@ -2,72 +2,47 @@
 #include "stack.h"
 #include "bintree.h"
 
-//TODO: binären Suchbaum implementieren
-/*  * `addToTree`: fügt ein neues Element in den Baum ein (rekursiv),
-    * `clearTree`: gibt den gesamten Baum frei (rekursiv),
-    * `treeSize`: zählt die Knoten im Baum (rekursiv),
-    * `nextTreeData`: Traversierung mit Hilfe des zuvor implementierten Stacks. */
-
 // Adds a copy of data's pointer destination to the tree using compareFct for ordering. Accepts duplicates
 // if isDuplicate is NULL, otherwise ignores duplicates and sets isDuplicate to 1 (or to 0 if a new entry is added).
 TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFctType compareFct, int *isDuplicate)
 {
-    // Teil 1: Trivialfall (Einfügen des neuen Knotens)
-    if(root == NULL)
+    if (root == NULL)
     {
-        // Speicher für den Knoten selbst reservieren
-        TreeNode *newNode = (TreeNode*)malloc(sizeof(TreeNode));
+        TreeNode *newNode = (TreeNode *)malloc(sizeof(TreeNode));
         if (newNode == NULL)
-        {
-            return NULL; // Fehler beim Allokieren
-        }
+            return NULL;
 
-        // Speicher für die Datenkopie reservieren
         newNode->data = malloc(dataSize);
         if (newNode->data == NULL)
         {
             free(newNode);
-            return NULL; // Fehler beim Allokieren
+            return NULL;
         }
 
-        // Daten kopieren
         memcpy(newNode->data, data, dataSize);
-
-        // Initialisieren
         newNode->left = NULL;
         newNode->right = NULL;
 
-        // Flag setzen und Knoten zurückgeben
         if (isDuplicate != NULL) *isDuplicate = 0;
         return newNode;
     }
 
-    // Teil 2: Rekursiver Fall (Vergleich)
     int comparison = compareFct(data, root->data);
 
     if (comparison == 0)
     {
-        // Duplikat gefunden
         if (isDuplicate != NULL) *isDuplicate = 1;
-        // Duplikate werden akzeptiert, wenn isDuplicate == NULL (siehe bintree.h)
-        // Da wir aber in createNumbers Duplikate vermeiden wollen, geben wir hier einfach root zurück.
-
-        // Wenn Duplikate erlaubt sind, könntest du hier einen zweiten Knoten einfügen,
-        // aber standardmäßig überspringen wir Duplikate, wenn isDuplicate gesetzt ist.
         return root;
     }
     else if (comparison < 0)
     {
-        // Wert ist kleiner -> gehe nach links
         root->left = addToTree(root->left, data, dataSize, compareFct, isDuplicate);
     }
-    else // comparison > 0
+    else
     {
-        // Wert ist größer -> gehe nach rechts
         root->right = addToTree(root->right, data, dataSize, compareFct, isDuplicate);
     }
 
-    // 3. Wenn die Rekursion zurückkehrt, wird der aktuelle root-Pointer zurückgegeben.
     return root;
 }
 
@@ -76,81 +51,53 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
 // push the top node and push all its left nodes.
 void *nextTreeData(TreeNode *root)
 {
-/* static iterator state */
-    static TreeNode **stack = NULL;
-    static int top = -1;
-    static int capacity = 0;
+    /* static iterator state using stack.c */
+    static StackNode *stack = NULL;
     static TreeNode *currentRoot = NULL;
 
-    /* helper: ensure capacity */
-    if (capacity == 0) {
-        capacity = 16;
-        stack = (TreeNode**)malloc(capacity * sizeof(TreeNode*));
-        if (stack == NULL) { capacity = 0; return NULL; }
-    }
-
-    /* helper: push one node */
-    #define PUSH_NODE(n) do { \
-        if (top + 1 >= capacity) { \
-            int newcap = capacity * 2; \
-            TreeNode **tmp = (TreeNode**)realloc(stack, newcap * sizeof(TreeNode*)); \
-            if (tmp == NULL) { /* allocation failed, keep old stack */ break; } \
-            stack = tmp; capacity = newcap; \
-        } \
-        stack[++top] = (n); \
-    } while(0)
-
     /* helper: push node and all left descendants */
-    void push_lefts(TreeNode *n) {
-        while (n != NULL) {
-            PUSH_NODE(n);
+    void push_lefts(TreeNode *n)
+    {
+        while (n != NULL)
+        {
+            stack = push(stack, (void *)n);
             n = n->left;
         }
     }
 
-    /* If a new root is provided and differs from current, reset iterator */
-    if (root != NULL && root != currentRoot) {
-        free(stack);
+    /* If a new root is provided and differs from current, or explicit restart with same root, reset iterator */
+    if (root != NULL && root != currentRoot)
+    {
+        clearStack(stack);
         stack = NULL;
-        top = -1;
-        capacity = 0;
         currentRoot = root;
-
-        /* reinitialize stack */
-        capacity = 16;
-        stack = (TreeNode**)malloc(capacity * sizeof(TreeNode*));
-        if (stack == NULL) { capacity = 0; return NULL; }
-        top = -1;
         push_lefts(root);
-    } else if (root != NULL && root == currentRoot) {
-        /* explicit restart with same root: reset and push again */
-        free(stack);
+    }
+    else if (root != NULL && root == currentRoot)
+    {
+        /* explicit restart with same root */
+        clearStack(stack);
         stack = NULL;
-        top = -1;
-        capacity = 0;
-        capacity = 16;
-        stack = (TreeNode**)malloc(capacity * sizeof(TreeNode*));
-        if (stack == NULL) { capacity = 0; return NULL; }
-        top = -1;
         push_lefts(root);
     }
     /* if root == NULL: continue with existing stack */
 
     /* nothing left */
-    if (top < 0) {
-        free(stack);
-        stack = NULL;
-        capacity = 0;
+    if (stack == NULL)
+    {
         currentRoot = NULL;
         return NULL;
     }
 
     /* pop top */
-    TreeNode *node = stack[top--];
+    TreeNode *node = (TreeNode *)top(stack);
+    stack = pop(stack);
+
     void *result = node->data;
 
     /* if right child exists, push it and all its lefts */
-    if (node->right != NULL) {
+    if (node->right != NULL)
+    {
         push_lefts(node->right);
     }
 
@@ -160,38 +107,23 @@ void *nextTreeData(TreeNode *root)
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)
 {
-    // 1. Basis-Fall: Wenn der Knoten NULL ist, beende
     if (root == NULL)
-    {
         return;
-    }
 
-    // 2. Rekursiver Schritt (gehe in die Tiefe)
-
-    // Gib den linken Teilbaum frei
     clearTree(root->left);
-
-    // Gib den rechten Teilbaum frei
     clearTree(root->right);
 
-    // 3. Aktion: Gebe die Ressourcen dieses Knotens frei
-
-    // Zuerst die dynamisch kopierten Daten freigeben (siehe addToTree)
     if (root->data != NULL)
-    {
-        free(root->data); // Speicher für die Zahl freigeben
-    }
+        free(root->data);
 
-    // Dann den Knoten selbst freigeben
     free(root);
 }
 
 // Returns the number of entries in the tree given by root.
 unsigned int treeSize(const TreeNode *root)
 {
-    if (root == NULL) {         //0 for end
-        return 0;
-    }
-    return 1u + treeSize(root->left) + treeSize(root->right); //using 1u to insure unsigned
-    //recursively adds entries in the tree after root to left and right
-}
\ No newline at end of file
+    if (root == NULL)
+        return 0u;
+
+    return 1u + treeSize(root->left) + treeSize(root->right);
+}
diff --git a/makefile b/makefile
index f92d187..d397220 100644
--- a/makefile
+++ b/makefile
@@ -32,6 +32,8 @@ doble : main.o $(program_obj_files)
 $(program_obj_filesobj_files): %.o: %.c
 	$(CC) -c $(FLAGS) $^ -o $@
 
+#Ab hier redundant -------------------
+
 main.o: main.c
 	$(CC) -c $(FLAGS) main.c