std::string decodeUTF8EscapeCodes(const std::string& input) {
    std::stringstream result;

    for (size_t i = 0; i < input.size(); ++i) {
        if (input[i] == '' && input[i + 1] == 'u') {
            // Extracting hexadecimal value
            std::string hexCode = input.substr(i + 2, 4);
            unsigned int unicodeValue = std::stoi(hexCode, nullptr, 16);

            // Handling UTF-8 encoding
            if (unicodeValue <= 0x7F) {
                result << static_cast<char>(unicodeValue);
            } else if (unicodeValue <= 0x7FF) {
                result << static_cast<char>(0xC0 | ((unicodeValue >> 6) & 0x1F));
                result << static_cast<char>(0x80 | (unicodeValue & 0x3F));
            } else if (unicodeValue <= 0xFFFF) {
                result << static_cast<char>(0xE0 | ((unicodeValue >> 12) & 0x0F));
                result << static_cast<char>(0x80 | ((unicodeValue >> 6) & 0x3F));
                result << static_cast<char>(0x80 | (unicodeValue & 0x3F));
            } else if (unicodeValue <= 0x10FFFF) {
                result << static_cast<char>(0xF0 | ((unicodeValue >> 18) & 0x07));
                result << static_cast<char>(0x80 | ((unicodeValue >> 12) & 0x3F));
                result << static_cast<char>(0x80 | ((unicodeValue >> 6) & 0x3F));
                result << static_cast<char>(0x80 | (unicodeValue & 0x3F));
            }
            // Move ahead by 5 characters as uXXXX is 6 characters in total
            i += 5;
        } else {
            result << input[i];
        }
    }

    return result.str();
}