Function truncate

truncate(str: string, length: number, suffix?: string): string
Truncates a string to a specified length, adding a suffix if needed.
Parameters
- str: string
  The string to truncate.
- length: number
  The maximum allowed length.
- suffix: string = '...'
  The suffix to add (default is '...').
Returns string
The truncated string.
Example
```
truncate('Hello World', 5); // 'Hello...'
```
- Defined in string/truncate.ts:12