chore: migrate

Stack.cpp

@@ -0,0 +1,23 @@
+#include "Stack.h"
+
+Stack::Stack()
+{
+    stack = new List;
+}
+
+void Stack::push(int newdata)
+{
+    stack->addFirst(newdata);
+}
+
+int Stack::pop()
+{
+    int ret = stack->returnFirst();
+    stack->removeFirst();
+    return ret;
+}
+
+Stack::~Stack()
+{
+    delete stack;
+}