How to insert a character every N characters in a string in C++

Question

How can I insert a character into a string exactly after 1 character?

I need to insert \'|\' into the string after every other char

Answer 1

std::string tokenize(const std::string& s) {
   if (!s.size()) {
     return "";
   }
   std::stringstream ss;
   ss << s[0];
   for (int i = 1; i < s.size(); i++) {
     ss << '|' << s[i];
   }
   return ss.str();
}