public class Solution
extends Object
1002 - Find Common Characters\.
Easy
Given a string array `words`, return _an array of all characters that show up in all strings within the_ `words` _(including duplicates)_. You may return the answer in **any order**.
**Example 1:**
**Input:** words = ["bella","label","roller"]
**Output:** ["e","l","l"]
**Example 2:**
**Input:** words = ["cool","lock","cook"]
**Output:** ["c","o"]
**Constraints:**
* `1 <= words.length <= 100`
* `1 <= words[i].length <= 100`
* `words[i]` consists of lowercase English letters.