I want to pass a column character as parameter to subroutine. What
should I define it as? Also how can I use that inside subroutine?

For example, the API the subroutine should look like is as below:

formatColumn("C") - Should format column C as per defined in the
subroutine. I'm also not clear how I can use this "C" inside
subroutine to identify which column it is. I'm just requested to have
function such as this.

Any suggestions appreciated.

thanks,
Anand.