Function accrued_fixed_leg 

fn accrued_fixed_leg(
    currency: Currency,
    effective: NaiveDate,
    maturity: NaiveDate,
    notional: f64,
    fixed_rate: f64,
    day_count: DayCountFraction,
    accrual: f64,
    compounding: AccrualCompounding,
    direction: Direction,
) -> Leg