Remove 2nd IP address from packet header

Hi, I need help creating an iRule, that looks at a packet header, and if the header has a 2nd IP address, remove the 2nd address, if it doesn't, then pass through as normal

 

eg header below

 

Example: 2019-03-21 [https 10.10.10.10, 10.11.11.11] INFO

 

Any help would be appreciated