Function unquote

unquote(text?): string | undefined | null
Returns a string that unquotes the given text
Parameters
- Optionaltext: null | string
  the text to inspect
Returns string | undefined | null
a string that unquotes the given text
Example
```
unquote(undefined);    // undefined
unquote('\'foobar\'');    // 'foobar'
unquote('"foobar"');    // 'foobar'
```