updating to newer version

Startcode/stack.c

@@ -0,0 +1,33 @@
+#include <stdlib.h>
+#include "stack.h"
+
+//TODO: grundlegende Stackfunktionen implementieren:
+/*  * `push`: legt ein Element oben auf den Stack,
+    * `pop`: entfernt das oberste Element,
+    * `top`: liefert das oberste Element zurück,
+    * `clearStack`: gibt den gesamten Speicher frei. */
+
+// Pushes data as pointer onto the stack.
+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)
+{
+
+}
+
+// Returns the data of the top element.
+void *top(StackNode *stack)
+{
+
+}
+
+// Clears stack and releases all memory.
+void clearStack(StackNode *stack)
+{
+
+}