Need help with the following. Any and all help appreciated. Thanks:)

I have included the code and instructions below.

#include #include using namespace std; // FIXME: Use a static variable to count permutations. Why must it be static? void PermuteString(string head, string tail) { char current; string newPermute; int len; int i; current = '?'; len = tail.size(); if (len > input; if (input.size() > 0) { PermuteString("", input); } cout