Function truncate

truncate(str, length, ellipsis?): string
Truncates a string to a specified length and appends ellipsis if needed.
Parameters
- str: string
  The string to truncate.
- length: number
  The maximum length of the string (including ellipsis).
- ellipsis: string = "…"
  Optional. The ellipsis string to append. Defaults to "…".
Returns string
The truncated string with ellipsis if needed.
Example
```
truncate("Hello world", 8); // Returns: "Hello w…"
truncate("Short", 10); // Returns: "Short"
truncate("Very long string that needs truncation", 15); // Returns: "Very long str…"
truncate("Test", 3, "!!!"); // Returns: "!!!"
```
- Defined in string-manipulation/truncate.ts:17

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