fn calories(input) {
    var elves = []
    var current = 0

    for line in input.lines() {
        if line.empty() {
            elves.append(current)
	    current = 0
	    continue
	}

	current += line as!! int
    }

    elves.sort()
    elves.reverse()

    return elves[0..3].sum()
}

fn fib(x: int) {
    if x < 2 {
        return x
    }

    return fib(x - 1) + fib (x - 2)
}

fn codes(input: String): List<String> {
    val chars = input.chars()
                     .windowed(4)
		     .map(it -> it as Set)
		     .filter(-> $0.len() == 4)
		     .map(it -> it.join())
    return chars
}

## Will convert celsius to fahrenheit
fn fahrenheit(celsius) {
    return 32.0 + celsius * 1.8
}