Function surface_select_delta_wing_strikes 

pub fn surface_select_delta_wing_strikes(
    market: &SurfaceMarketContext,
    expiry: SurfaceTenor,
    absolute_delta: f64,
    convention: SurfaceDeltaConvention,
    volatility: f64,
    model: PricingModel,
    listed_strikes: &[f64],
) -> Result<SurfaceDeltaWingStrikeSelection, FerroRiskError>