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export default function oneEditAway(first: string, second: string): boolean {    const n = first.length;    const m = second.length;    const a = first;    const b = second;
    if (Math.abs(n - m) > 1) return false;    if (n > m) return oneEditAway(b, a);
    let i = 0;    let j = 0;    let cnt = 0;    while (i < n && j < m && cnt <= 1) {        const c1 = a[i];        const c2 = b[j];        if (c1 === c2) {            i++;
            j++;        } else {            if (n === m) {                i++;                j++;                cnt++;            } else {                j++;                cnt++;            }        }    }    return cnt <= 1;}