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export default function duplicateZeros(arr: number[]): void {    const ans: Array<number> = [];    const length = arr.length;    for (const num of arr) {        if (ans.length >= length) break;        if (num === 0) {            ans.push(0, 0);        } else {            ans.push(num);        }    }    ans.forEach((v, i) => {        if (i >= length) return;        arr[i] = v;    });}