def GetSvnTagName(url, postfix_tag, logger):
    """
    get svn tag name using it's url
    Args:
        url : svn url of module
        postfix_tag : postfix of tags
        logger : the object of Log.Log
    Returns :
        return svn tag name of module, if enconters some errors return None
    """
    if url.endswith(postfix_tag):
        tag_name = url.split('/')[-1]
        return tag_name
    else:
        logger.LevPrint('ERROR', 'Unknow name of tag!!Check the url %s' % (url), False)
        return None