Hi @Rajshri,
This seems to be an importing problem.
I would recommend to instead create an application project from this community post: HOWTO: S32 Design Studio - Create a New Application Project, and add your content to this base project, adding the static library from the previous example I shared and trying to compile it.
Custom implementation should come from customer's side, as it is out of this community's scope of help. I apologize for any inconveniences this may cause.
Best regards,
Julián