Function strip_from_callable 

pub fn strip_from_callable(
    bond: &CallableBond,
    valuation: NaiveDate,
) -> Vec<StripPoint>

The co-terminal ATM strip a callable bond implies: one point per exercisable entry strictly inside (valuation, maturity) — expiry at the call date, underlying to the bond’s maturity. Make-whole entries are skipped; duplicate dates dedup.