Function normalizeFileExtension

normalizeFileExtension(ext): string
Normalize a file extension to the form: .[ext] Anything before the last "." is not returned.
Parameters
- ext: string
  
  file extension
Returns string
The normalized file extension.
Throws
If the extension contains illegal characters or is equal to '.'

Example
```
normalizeFileExtension('jpg');;
//=> '.jpg'
normalizeFileExtension('.jpg');;
//=> '.jpg'
normalizeFileExtension('..jpg');;
//=> '.jpg'
normalizeFileExtension('');;
//=> ''
normalizeFileExtension('.');;
//=> ''
normalizeFileExtension('jpg|png');;
//=> Error
```
- Defined in packages/util/src/path/normalizeFileExtension.ts:22

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