Attorney’s fees — Proposal for settlement — Judgment at least 25% more than offer — Calculation — Trial court erred by interpreting term “postoffer settlement” in section 768.79(6) to mean settlement after expiration of the time for accepting the offer — Clear and unambiguous language of statute requires judgment obtained to include the amount of any settlement by a codefendant after the date of service of the offer on the defendant by which the verdict was reduced — Where it was undisputed that plaintiff reached a settlement with codefendant after serving her offer on the defendant, and the verdict in favor of plaintiff was reduced by the amount of that settlement, the trial court was required to add the amount of that settlement to the net judgment in calculating the judgment obtained and determining plaintiff’s entitlement to fees