10. Longest Common Prefix
Write a function that finds the longest common prefix among an array of strings.
範例 1:
輸入： strs = ["flower","flow","flight"] 輸出： fl
範例 2:
輸入： strs = ["dog","racecar","car"] 輸出：
限制條件：
1 <= strs.length <= 200
● 已自動儲存第 1 行，第 1 欄