fn countingValleys(steps: i32, path: &str) -> i32 {
    let (_, valley) = path.bytes()
        .fold((0, 0), |mut acc, step| {
            if acc.0 == -1 && step == b'U' {
                acc.1 += 1;
            }
            
            if step == b'U' { 
                acc.0 += 1
            } else if step == b'D' { 
                acc.0 -= 1;
            }
            
            acc
        });
    valley
}