[C++] Write the C++ function dupe, which creates duplicates of each element in a list such that the copied element immediately follows the original. See examples below for what we mean by this. The Node and ListType definitions are on the code handout. Some examples: list before call to dupe list after call to dupe (list) [2,7,3] [2,2,7,7,3,3] [2,2,7,7,3,3] [2,-7,-7,2] [0] [] [2,2,2,2,7,7,7,7,3,3,3,3] [2,2,-7,-7,-7,-7,2,2] [0,0] [] // PRE: list is a well-formed linked list void dupe (ListType & list) {