Function CharacterIsDigit

src/include/common/string_utils.h:37–37

    }
    static bool characterIsNewLine(char c) { return c == '\n' || c == '\r'; }
    static bool CharacterIsDigit(char c) { return c >= '0' && c <= '9'; }

    static std::string ltrim(const std::string& input) {
        auto s = input;