Multiply 
by null @uid11
**This challenge continues from [476 - Sum](https://tsch.js.org/476), it is recommended that you finish that one first, and modify your code based on it to start this challenge.**
Implement a type `Multiply` that multiplies two non-negative integers and returns their product as a string. Numbers can be specified as string, number, or bigint.
For example,
```ts
type T0 = Multiply<2, 3> // '6'
type T1 = Multiply<3, '5'> // '15'
type T2 = Multiply<'4', 10> // '40'
type T3 = Multiply<0, 16> // '0'
type T4 = Multiply<'13', '21'> // '273'
type T5 = Multiply<'43423', 321543n> // '13962361689'
```
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