[LeetCode] Anagrams

Given an array of strings, return all groups of strings that are anagrams.

Note: All inputs will be in lower-case.

Idea: 

• Put the array of String(convert to char) into a queue
• Merge sort all of the item in the queue
• Use a Hashtable, put sorted string as key, Stack as value (which has a stack of original string)
• Iterate the Hashtable, Iterate stack which size is greater than, put the String into ArrayList from that stack