Function SetDefaultFilename

SetDefaultFilename(
    filepath: string,
    engine: AioTextProcessorMethods,
    qty?: number,
): string
Generates a default filename based on the provided filepath, engine, and quantity.
Parameters
- filepath: string
  The path of the file.
- engine: AioTextProcessorMethods
  The engine used for processing.
- Optionalqty: number
  The quantity of files to generate names for. If greater than 0, an array of filenames is returned.
Returns string
- The default filename or an array of default filenames.
Example
```
// Returns "translate_myFile.txt"
SetDefaultFilename("myFile.docx", "translate");
```
Example
```
// Returns ["myFile_translate_1.txt", "myFile_translate_2.txt", "myFile_translate_3.txt"]
SetDefaultFilename("myFile.pdf", "translate", 3);
```
Remarks
- If the file extension is 'docx' or 'pdf', it's temporarily changed to '.txt'.
- If qty is greater than 0, it generates an array of filenames with an index.
- Otherwise, it generates a single filename.