15.1.5: Complete this function for removing and returning the first element of a linked list. Complete this function for removing and returning the first element of a linked list. If the list is empty, return the empty string. \( \begin{aligned} 1 & \text { \#include } \\ 2 & \text { \#include } \\ 3 & \\ 4 & \text { using namespace std; } \\ 5 & \\ 6 & \text { string remove_first(list\& strings) } \\ 7 & \{ \\ 8 & \text { auto iter }=\text { strings.begin }() ; \\ 9 & \text { string result; } \\ 10 & \\ 11 & V^{*} \text { Your code goes here } * / \\ 12 & \\ 13 & \text { return result; } \\ 14 & \end{aligned} \)