<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_footer(self, text: str, icon_url: str = None) -> None: """ Sets the footer of the embed. Parameters text: str The footer text. icon_url: str, optional URL for the icon in the footer. """

        self.footer = {
            'text': text,
            'icon_url': icon_url
        }