const lengthOfLastWord = function(s) {
    if (s.length === 0) return 0
    let count = 0
    for (let i = s.length - 1; i >= 0; i--) {
        if (s.charAt(i) === ' ') {
            if (count === 0) continue
            break
        }
        count++
    }
    return count
}