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export default function addStrings(num1: string, num2: string) {    const result: number[] = [];    let carry = 0;    for (let i = 0; i < Math.max(num2.length, num1.length); i++) {        // console.log(i, num1[i], num2[i], carry);        const r = carry +            Number(getIntegerReverse(num1, i)) +            Number(getIntegerReverse(num2, i));        result.push(r % 10);        carry = Math.floor(r / 10);    }    if (carry) result.push(carry);    return result.reverse().join("");}
function getIntegerReverse(s: string, i: number) {    if (i < 0) {        throw Error("out of bounds");    }    if (i < s.length) {        return Number(s.slice(-1 - i)[0]);    } else {        return 0;    }}