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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 helper_list(access_token, oid, path):
    '''Helper Function to list a URL path.

    Args:
        access_token (str): A valid Azure authentication token.
        oid (str): An OID.
        path (str): A URL Path.

    Returns:
        HTTP response. JSON body.
    '''
    if oid != "":
        path = ''.join([path, "('", oid, "')"])
    endpoint = ''.join([ams_rest_endpoint, path])
    return do_ams_get(endpoint, path, access_token)