8. Length of Last Word
Given a string s, return the length of its last word.
範例 1:
輸入： s = "Hello World" 輸出： 5
範例 2:
輸入： s = " fly me to the moon " 輸出： 4
限制條件：
1 <= s.length <= 10^4
● 已自動儲存第 1 行，第 1 欄
Given a string s, return the length of its last word.
輸入： s = "Hello World" 輸出： 5
輸入： s = " fly me to the moon " 輸出： 4
1 <= s.length <= 10^4