(20) Question 2: Using a stack abstract data type Assume that you've been given an absiract data type for a stuck. It has the following operations ld push.on.stackrant tAckti t the sewta the top Write a C++ function twice_the_it ema.) that, given me alters it so that every ele- ment in the stack now appears twice. For example. if we had 3 719 5 placed on the stack st.k on tht order), it would contain 3 3 7?-19-19 6 6 arter calling twice-the-item (stk Iny ortimy: It is an ADT. don't make any assumptions about the implementation of int-tack_c assumptions about the implementation of intstackt void twice the items (int stackt .istk)