<Kotlin. Function does not exit recursion after re...

# stackoverflow

[user]

Kotlin. Function does not exit recursion after return
I need to decompose the number l into prime factors. For this I use recursion. And when l = 1, the function must exit their recursion and return the string in which the prime factors are located, however, the function continues to work and already according to a principle incomprehensible to me. Please explain what is the problem with my code?
fun factors(l: Int): String {

return if (l == 1) {
answer
} else {
for (i in 2..l) {
if (l % i == 0) {...