kotlin collatz conjeture resolver

CollatzController.kt

package com.puravida

import java.math.BigInteger
import javax.ws.rs.GET
import javax.ws.rs.Path
import javax.ws.rs.PathParam
import javax.ws.rs.Produces
import javax.ws.rs.core.MediaType

@Path("/hello")
class CollatzController {

    @GET
    @Path("{number}")
    @Produces(MediaType.TEXT_PLAIN)
    fun resolve(@PathParam("number") find : String) :String{
        var current = find.toBigInteger()
        var steps = 1
        var zero = BigInteger.valueOf(0)
        val one = BigInteger.valueOf(1)
        val two = BigInteger.valueOf(2)
        val three = BigInteger.valueOf(3)
        while( current > one){
            if( current.mod(two) == zero ){
                current = current.divide(two)
            }else{
                current = current.multiply(three).add(one)
            }
            steps++
        }
        return "$steps"
    }
}