// Please implement the `ComputationError.IllegalArgument` error.

pub const ComputationError = error{IllegalArgument};

pub fn steps(number: usize) anyerror!usize {
    if (number == 0) {
        return ComputationError.IllegalArgument;
    }
    return collatz(number, 0);
}

fn collatz(number: usize, acc: usize) usize {
    if (number == 1) {
        return acc;
    }

    const next = if (number % 2 == 0) number / 2 else number * 3 + 1;

    return collatz(next, acc + 1);
}