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export default function discountPrices(    sentence: string,    discount: number,): string {    return sentence.split(" ").map((s) => {        if (!s.startsWith("$")) return s;        if (s.length === 1) return s;        const num = Number(s.slice(1));        if (Number.isNaN(num)) return s;
        return "$" + (num * (1 - discount / 100)).toFixed(2);    }).join(" ");}