úÎvì SafeAbstract Stack data typeCreate new StackTest if stack is emptyPush item onto Stack<Pop most recently added item without removing from the Stack!Pop most recently item from Stack1Compute number of elements contained in the Stack      "Stack-0.1.0-GqukUsOguO3AI7mO7yXtyz Data.StackStackstackNew stackIsEmpty stackPush stackPeekstackPop stackSize $fReadStack $fShowStack