Function centerPad

centerPad(str: string, length: number, padWith?: string): string
Pads the string with the padWith so that it appears in the center of a new string with the provided length.
Parameters
- str: string
- length: number
- padWith: string = ' '
Returns string
Usage
```
const str = "Hello, World!";

const padded = centerPad(str, str.length + 4);

console.log(padded); // '  Hello, World!  '
```
- Defined in pad.ts:99