Add helper to copy-transform a string, wrapping std::transform

     * @return List of all the substrings with all empty substrings ignored (thus removed)

     */

    template <typename T> std::vector<T> split(std::string str, const std::string& delims = " \t,");

    /**

     * @brief Transforms a string and returns the transformed string

     * @param str String that should be transformed

     * @param op Unary operator to act on the string

     * @return Transformed string

     */

    template <typename T> std::string transform(const std::string& str, const T& op);

} // namespace allpix

// Include template definitions

        return elems;

    }

    template <typename T> std::string transform(const std::string& str, const T& op) {

        auto output = str;

        std::transform(output.begin(), output.end(), output.begin(), op);

        return output;

    }

} // namespace allpix