Method sep

util/string/util.h:130–133

See strsep [BUT argument is *&, not **]

    /// See strsep [BUT argument is *&, not **]
    char* sep(char*& s) const {
        char sep_char; // unused;
        return sep(s, sep_char);
    }

    /// strsep + remember character that was destroyed
    char* sep(char*& s, char& sep_char) const {