function push is done

stack.c

@@ -10,7 +10,12 @@
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data)
 {
-
+StackNode *newNode = (StackNode *)malloc(sizeof(StackNode));
+if(newNode == NULL)
+  return NULL;
+newNode->data = data;
+newNode->next = stack;
+return newNode;
 }
 
 // Deletes the top element of the stack (latest added element) and releases its memory. (Pointer to data has to be

stack.h

@@ -10,12 +10,10 @@ The latest element is taken from the stack. */
 //TODO: passenden Datentyp als struct anlegen
 
 
-typedef struct Node{
-  int *data;
-  struct Node *next;
-
-  } StackNode;
-
+typedef struct StackNode {
+    void *data;
+    struct StackNode *next;
+} StackNode;
 
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data);