add typdef StackNode

stack.c

@@ -8,26 +8,23 @@
     * `clearStack`: gibt den gesamten Speicher frei. */
 
 // Pushes data as pointer onto the stack.
-StackNode *push(StackNode *stack, void *data)
-{
+typedef struct  Stack_node{
+    int *stackNode;
+}StackNode;
+
+StackNode *push(StackNode *stack, void *data) {
 
 }
 
 // Deletes the top element of the stack (latest added element) and releases its memory. (Pointer to data has to be
 // freed by caller.)
-StackNode *pop(StackNode *stack)
-{
-
+StackNode *pop(StackNode *stack) {
 }
 
 // Returns the data of the top element.
-void *top(StackNode *stack)
-{
-
+void *top(StackNode *stack) {
 }
 
 // Clears stack and releases all memory.
-void clearStack(StackNode *stack)
-{
-
+void clearStack(StackNode *stack) {
 }