The path for icons are very funky, depending on the icon number you need to format the path very specifically, here is a function that does it in PHP which should be easy to translate into other languages:
```php
// Is the number 6 or more characters?
$extended=(strlen($number)>=6);
// get icon based on number size, prepend 0 if its below 6 characters.
$icon=$extended
?str_pad($number,5,"0",STR_PAD_LEFT)
:'0'.str_pad($number,5,"0",STR_PAD_LEFT);
// build path, take values [0, 1, 2] from the number, add 000 for extended
// for non extended start with 0 and add [1,2] + 000 for path.