def normalize_list_params(params):
    """
    Normalizes parameters that could be provided as strings separated by ','.

    >>> normalize_list_params(["f1,f2", "f3"])
    ["f1", "f2", "f3"]

    :param params: Params to normalize.
    :type params: list

    :return: A list of normalized params.
    :rtype list
    """
    normalized_params = []
    for f in list(params):
        if "," in f:
            normalized_params += f.split(",")
        else:
            normalized_params.append(f)

    return normalized_params