def get_project_slug(self, bet):
if bet.get('<STR_LIT>'):<EOL><INDENT>params = json.loads(bet['<STR_LIT>'])<EOL>return params.get('<STR_LIT>')<EOL><DEDENT>return None<EOL>
Return slug of a project that given bet is associated with
        or None if bet is not associated with any project.