int osc_message_add_string(struct osc_message *msg, const char *data){
    unsigned int length_data = strlen(data);
    unsigned int length = osc_message_argc(msg); //typetag
    unsigned int overall_length = osc_message_serialized_length (msg);
    unsigned int address_length = length_address(msg);
    if (length % 4 == 2){
        void *ptr = realloc (msg->raw_data, overall_length + 8 + length_data + 4 - (strlen(data) % 4));
        if (!ptr) {
            return 1;
        }
	msg->raw_data = ptr;
            msg->address = ((char *)msg->raw_data + 4); // + 4 pointer na adresu
        msg->typetag = msg->address + address_length;

        memmove(msg->typetag + 6 + length, msg->typetag + length + 2,
               overall_length - address_length - length - 2);
        *(msg->typetag + length + 1) = OSC_TT_STRING;
        memcpy (msg->typetag + length + 2, "s\0\0\0\0", 4);
        memcpy (msg->address + overall_length + 4, &data, length_data);
        memset (msg->address + overall_length + 4 + length_data,'\0', 4 - strlen(data) % 4);
    } else {
	void *ptr = realloc (msg->raw_data, overall_length + 4 + length_data);
        if (!ptr) {
            return 1;
        }
	msg->raw_data = ptr;
        msg->address = ((char *)msg->raw_data + 4);
        msg->typetag = msg->address + address_length;
        memcpy (msg->address + overall_length, &data, length_data);
        memset (msg->address + overall_length + length_data, '\0',  4 - strlen(data) % 4);
        *(msg->typetag + length + 1) = OSC_TT_STRING;
    }
    *(int32_t *) msg->raw_data = overall_length + length_data;
    return 0;
}