How to get Optional<String> from String? and String in Kotlin -

i have overridden function in kotlin returns optional<string>. how convert string? , string types optional<string>?

example:

override fun getcurrentauditor(): optional<string> {     val username = securityutils.currentuserlogin     return username ?: system_account } 

from above example:

username string?

system_account string

i'm getting errors on return statement both variables not optional<string> types.

just create 1 wrap string value, in case:

override fun getcurrentauditor(): optional<string> {     val username = securityutils.currentuserlogin     return optional.of(username ?: system_account) }