diff --git a/bintree.c b/bintree.c
index debfc9e..22625e6 100644
--- a/bintree.c
+++ b/bintree.c
@@ -14,28 +14,26 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
 {
 	if(!root)
 	{
-		root = malloc(sizeof(node));
-		*node newNode;
-		*newNode.data = malloc(dataSize);
-		strcpy(*newNode.data, data);
-		*newNode.left = NULL;
-		*newNode.right = NULL;
+		//root = malloc(sizeof(TreeNode));
+		TreeNode *newNode = malloc(sizeof(TreeNode));
+		newNode->data = malloc(dataSize);
+		strcpy(newNode->data, data);
 		if(isDuplicate)
 			*isDuplicate = 0;
 		return newNode;
 	}
-	if(compareFct(*data, *root->data) > 0)
+	if(compareFct(data, root->data) > 0)
 	{
-		*right = addToTree(right, data, dataSize, compareFct, isDuplicate);
+		root->right = addToTree(root->right, data, dataSize, compareFct, isDuplicate);
 	}
-	else if(compareFct(*data, *root->data) < 0)
+	else if(compareFct(data, root->data) < 0)
 	{
-		*left = addToTree(right, data, dataSize, compareFct, isDuplicate);
+		root->left = addToTree(root->left, data, dataSize, compareFct, isDuplicate);
 	}
 	else
 	{
 		if(!isDuplicate)
-			*left = addToTree(right, data, dataSize, compareFct, isDuplicate);
+			root->left = addToTree(root->left, data, dataSize, compareFct, isDuplicate);
 		else
 		{
 			*isDuplicate = 1;
@@ -51,7 +49,7 @@ void *nextTreeData(TreeNode *root)
 {
 	StackNode *stackRoot = NULL;//Generates a new, empty stack
 	stackRoot = iterateThroughTree(root, stackRoot); //Fills the stack via the helping function iterateThroughTree
-	stackNode * tempBuffer = pop(stackRoot);
+	StackNode * tempBuffer = pop(stackRoot);
 	clearStack(stackRoot);
 	return tempBuffer;
 }
@@ -64,7 +62,7 @@ StackNode *iterateThroughTree(TreeNode *root, StackNode *stackRoot)
 		return stackRoot;
 	}
 	stackRoot = iterateThroughTree(root->left, stackRoot);
-	stackNode = push(stackNode, root->data);
+	stackRoot = push(stackRoot, root->data);
 	stackRoot = iterateThroughTree(root->right, stackRoot);
 	return stackRoot;
 }
@@ -72,12 +70,12 @@ StackNode *iterateThroughTree(TreeNode *root, StackNode *stackRoot)
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)
 {
-	if(left)
-		clearTree(left);
-	if(right)
-		clearTree(right);
-	free(data);
-	data = NULL;
+	if(root->left)
+		clearTree(root->left);
+	if(root->right)
+		clearTree(root->right);
+	free(root->data);
+	root->data = NULL;
 	free(root);
 	root = NULL;
 }
@@ -88,10 +86,10 @@ unsigned int treeSize(const TreeNode *root)
 	if(root)
 	{
 		unsigned int tempSize = 0;
-		if(left)
-			tempSize += treeSize(left);
-		if(right)
-			tempSize += treeSize(right);
+		if(root->left)
+			tempSize += treeSize(root->left);
+		if(root->right)
+			tempSize += treeSize(root->right);
 		return tempSize + 1;
 	}
 	return 0;
diff --git a/bintree.h b/bintree.h
index db8bc8d..e9244b8 100644
--- a/bintree.h
+++ b/bintree.h
@@ -2,6 +2,7 @@
 #define BINTREE_H
 
 #include <stdlib.h>
+#include "stack.h"
 
 typedef int (*CompareFctType)(const void *arg1, const void *arg2);
 
@@ -24,5 +25,5 @@ void clearTree(TreeNode *root);
 // Returns the number of entries in the tree given by root.
 unsigned int treeSize(const TreeNode *root);
 //Function to aid nextTreeData
-StackNode iterateThroughTree(TreeNode *root, StackNode stackRoot);
+StackNode *iterateThroughTree(TreeNode *root, StackNode *stackRoot);
 #endif
\ No newline at end of file
diff --git a/numbers.c b/numbers.c
index cc26bea..a7531cc 100644
--- a/numbers.c
+++ b/numbers.c
@@ -11,7 +11,7 @@
   * Duplizieren eines zufälligen Eintrags im Array.
   * in `getDuplicate()`: Sortieren des Arrays und Erkennen der doppelten Zahl durch Vergleich benachbarter Elemente. */
 
-// Returns len random numbers between 1 and 2x len in random order which are all different, except for two entries.
+//1 Returns len random numbers between 1 and 2x len in random order which are all different, except for two entries.
 // Returns NULL on errors. Use your implementation of the binary search tree to check for possible duplicates while
 // creating random numbers.
 unsigned int *createNumbers(unsigned int len){
diff --git a/runNumbersTests.exe b/runNumbersTests.exe
index 27e922c..2df45cc 100644
Binary files a/runNumbersTests.exe and b/runNumbersTests.exe differ