[SOLVED] How can I change ()->Boolean to Boolean?

Question

fun main(args: Array<String>){
var n=123
if(n.sum()){
print("true")
}else{
print("false")
}

}
fun Int.sum()={
var s=0
for(c in this.toString()){
s+=c.toInt()-'0'.toInt()
}
s==this
}
if you try to run this code the output won't be false but an error because it cannot convert ()->Boolean to Boolean.... How can I make this work?

Answer 1

call the function (line 20 change.)
https://code.sololearn.com/cp2FzkS47MWd

Answer 2

John Wells thank you very much sir!