I am confused as to how to do this. I need to convert it to String. I tried `x.toString` but it doesn't see to work.

```
def doSomething(x: Int, function: Int => String): String = ???

assert(doSomething(5, (i: Int) => i.toString) == "5")
assert(doSomething(7, (i: Int) => (i + 5).toString) == "12")

```