stack Erklaerungen, numbers und bintree etwas angefangen

bintree.c

@@ -12,7 +12,22 @@
 // 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)
 {
-
+    if(root == NULL){
+        TreeNode *node;
+        node = (TreeNode*)malloc(sizeof(TreeNode)); 
+        if(node == NULL){
+            return NULL; 
+        }
+        node->data = malloc(dataSize);
+        if(node->data == NULL){ 
+            free(node); 
+            return NULL; 
+        }
+        memcpy(node->data, data, dataSize);
+        node->left;
+        node->right;
+        
+    }
 }
 
 // Iterates over the tree given by root. Follows the usage of strtok. If tree is NULL, the next entry of the last tree given is returned in ordering direction.

numbers.c

@@ -16,7 +16,17 @@
 // creating random numbers.
 unsigned int *createNumbers(unsigned int len)
 {
+if(len < 2)
+    return NULL;
+    
+  srand(time(NULL));
 
+  int count = 0;
+  while(count < len - 1){
+    int value = (rand() % (2 * len)) + 1;
+
+
+  }
 }
 
 // Returns only the only number in numbers which is present twice. Returns zero on errors.

stack.c

@@ -8,14 +8,18 @@
     * `clearStack`: gibt den gesamten Speicher frei. */
 
 // Pushes data as pointer onto the stack.
+
+
 StackNode *push(StackNode *stack, void *data)
 {
+    //Neue Node wird erstellt, Speicher wird zugewiesen
     StackNode *newNode = (StackNode *)malloc(sizeof(StackNode));
     if (newNode == NULL) {  
         return NULL; 
     }
-    newNode ->data = data;
-    newNode ->next = stack;
+    //Data und der zeiger auf den nächsten Node werden zugewiesen
+    newNode->data = data;
+    newNode->next = stack;
     return newNode;
 }
 
@@ -23,9 +27,11 @@ StackNode *push(StackNode *stack, void *data)
 // freed by caller.)
 StackNode *pop(StackNode *stack)
 {
+    //Wenn Stack leer, wird NULL zurückgegeben
     if(stack == NULL) {
         return NULL; 
-    }   
+    }  
+    //Nächster Node wird gespeichert, aktuellerr Node wird freigegeben
     StackNode *next = stack->next;
     free(stack);    
     return next;
@@ -43,6 +49,7 @@ if(stack == NULL) {
 // Clears stack and releases all memory.
 void clearStack(StackNode *stack)
 {
+    //Speichert den aktuellen Node, freed ihn dann und geht zum nächsten
     StackNode *temp;
     while(stack != NULL) {
         temp = stack;