def create_hf(geom):
    """Create header and footer for different types of geometries

    Args:
        geom (str): geometry type, e.g., polygone
    """

    if geom == "polygone":
        header = """
        {
        "type": "FeatureCollection",
        "features": [
        {
            "type": "Feature",
            "geometry": {
                "type": "Polygon",
                "coordinates": [
        """

        footer = """
                ]
            }
        }
        ]
        }"""
    else:
        raise ValueError(f"{geom} is not implemented.")

    return header, footer