i am trying to convert my following sequence code ...

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[Siva]

i am trying to convert my following sequence code to Functional style. any idea how to do so.

sequence code

fun start(code : String)  {
        val config = service.getConfig(code)
        if( config == null ) {
            return
        }
        // do actual biz logic based on config.
    }

functional style

fun start(code : String)  {
        val eitherConfig = service.getConfig(code)
        when(eitherConfig) {
            is Either.Left -> return
        }
        val config = either.b

        // do actual biz logic based on config.
    }

doubt: i am not sure how to break function when Right condition occurs and return it. or continue function with right flow.