Function format_units_with

pub fn format_units_with<T, K, E>(
    amount: T,
    units: K,
    separator: DecimalSeparator,
) -> Result<String, UnitsError>
where
    T: Into<ParseUnits>,
    K: TryInto<Unit, Error = E>,
    UnitsError: From<E>,

Formats the given number of Wei as the given unit with a custom decimal separator.