Substring issue

[AnEvilPenguin]

Hi,
I've come across an issue where in certain cases the Split-Word function seems to over-loop (the 2nd url sets off the error for me and does so even when just sending that into the function):

(Invoke-RestMethod -Method Get -Uri "https://istheinternetonfire.com/status.json").issues.urls | cowsay
Exception calling "Substring" with "1" argument(s): "startIndex cannot be larger than length of string.
Parameter name: startIndex"
At line:230 char:7
+       $splits += $word.substring($startPoint)
+       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentOutOfRangeException

 __________________________________________
/ https://www.drownattack.com/             \
| https://openssl.org/news/secadv/20160301 |
| .txt                                     |
| http://blog.cryptographyengineering.com/ |
\ 2016/03/attack-of-week-drown.html        /
 ------------------------------------------
      \  ^__^             
       \ (oo)\________    
         (__)\        )\/\
              ||----w |   
              ||     ||

I've managed to get around this by adding a break in as follows. I can't see specifically why this is over shooting on the for loop though as I've never tried to use a for loop in that way myself.

function Split-Word($word) {
  if($word.length -le $bubbleWidth) {
    return ,[string[]]@($word)
  }

  $splits = [string[]]@()

  foreach($i in (0..($word.length / $bubbleWidth))) {
    $startPoint = ($i * $bubbleWidth)
    if(($startPoint + $bubbleWidth) -gt $word.length) {
      $splits += $word.substring($startPoint)
      break
    } else {
      $splits += $word.substring($startPoint, $bubbleWidth)
    }
  }

  return ,[string[]]$splits
}

Sorry just joined git to post this issue.

Just in case it helps:

$PSVersionTable

Name                           Value                                                                                                                                                                     
----                           -----                                                                                                                                                                     
PSVersion                      5.0.10586.117                                                                                                                                                             
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                                                                                                                   
BuildVersion                   10.0.10586.117                                                                                                                                                            
CLRVersion                     4.0.30319.42000                                                                                                                                                           
WSManStackVersion              3.0                                                                                                                                                                       
PSRemotingProtocolVersion      2.3                                                                                                                                                                       
SerializationVersion           1.1.0.1