'Convert string to camel case' Kata Solution

#include <string>

std::string to_camel_case(std::string text) {
    std::string output;
    for(int iter = 0; iter < text.size(); ++iter)
    {
        if(text.at(iter) == '-' || text.at(iter) == '_')
        {
            text.at(iter) = toupper(text.at(++iter));
        }
        output += text.at(iter);
    }
    return output;
}