import click


def style_string(message, no_color, fg='yellow'):
    """
    Add color style to string if no_color is False.

    :param message: String to style.
    :param no_color: If True return string without style.
    :param fg: The color for the string style.
    :return: Return string conditionally style.
    """
    if no_color:
        return message
    else:
        return click.style(message, fg=fg)