Product of 2 numbers

Task

Implement function, that for given two numbers, presented as strings will return their product

multiply('1', '1') // -> '1', because 1 * 1 === 1
multiply('2', '2') // -> '4', because 2 * 2 === 4
multiply('5', '10') // -> '50', because 5 * 10 === 50

Write your code in src/index.js