Return the absorbing atom symboll and site index in the given structure.

    Args:
        absorbing_atom (str/int): symbol or site index
        structure (Structure)

    Returns:
        str, int: symbol and site index

def get_absorbing_atom_symbol_index(absorbing_atom, structure):
    """
    Return the absorbing atom symboll and site index in the given structure.

    Args:
        absorbing_atom (str/int): symbol or site index
        structure (Structure)

    Returns:
        str, int: symbol and site index
    """
    if isinstance(absorbing_atom, str):
        return absorbing_atom, structure.indices_from_symbol(absorbing_atom)[0]
    elif isinstance(absorbing_atom, int):
        return str(structure[absorbing_atom].specie), absorbing_atom
    else:
        raise ValueError("absorbing_atom must be either specie symbol or site index")