util: add stack_Clear

util/stack.c

@@ -69,3 +69,7 @@ uintptr_t stack_Size(stack *s) {
 uintptr_t stack_Space(stack *s) {
 	return s->top - s->data;
 }
+
+void stack_Clear(stack *s) {
+	s->top = s->data + s->size;
+}

util/stack.h

@@ -46,6 +46,9 @@ uintptr_t stack_Size(stack *s);
 // returns the empty space left in the stack
 uintptr_t stack_Space(stack *s);
 
+// clears the stack
+void stack_Clear(stack *s);
+
 
 #ifdef __cplusplus
 }