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export default function longestCommonPrefix(strs: string[]): string {    let ret = "";    const len = Math.min(...strs.map((s) => s.length));    for (let i = 0; i < len; i++) {        for (const s of strs) {            if (s[i] !== strs[0][i]) {                return ret;            }        }        ret += strs[0][i];    }    return ret;}