49. Group Anagrams

Description

Given an array of strings, group anagrams together.

Example:

Input: ["eat", "tea", "tan", "ate", "nat", "bat"],

Output:

[

  ["ate","eat","tea"],

  ["nat","tan"],

  ["bat"]

]

Note:

<li>All inputs will be in lowercase.</li>

<li>The order of your output does not&nbsp;matter.</li>