make callback of function kotlin code example

Example: kotlin callback

class Company<T> (text : T){ 
    var x = text 
    init{ 
        println(x) 
    } 
} 
fun main(args: Array<String>){ 
    var name: Company<String> = Company<String>("GeeksforGeeks") 
    var rank: Company<Int> = Company<Int>(12) 
}