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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def fetchImageUrl(self, image_id):
 """Fetches the url to the original image from an image attachment ID :param image_id: The image you want to fethc :type image_id: str :return: An url where you can download the original image :rtype: str :raises: FBchatException if request failed """

        image_id = str(image_id)
        data = {"photo_id": str(image_id)}
        j = self._get(
            ReqUrl.ATTACHMENT_PHOTO, query=data, fix_request=True, as_json=True
        )

        url = get_jsmods_require(j, 3)
        if url is None:
            raise FBchatException("Could not fetch image url from: {}".format(j))
        return url