Write the following struct struct Window $\{$ string appname; Window $*$next; Window $*$prev; $\}$; Create a class called WindowManager. Create private variables Window $*$ current, $*$ dummy. current will keep track of the $$current$$ program. Think of it as the program currently being used by the user in this simulated operating system. dummy will always point to the dummy node. Add the following private function. This function will be used to dynamically create new nodes for the linked list.