Group the anagrams together.

GroupWords.kt

/*
Given a list of strings, return a list of strings containing all anagrams grouped together. 

strs = ["car", "arc", "bee", "eeb", "tea"], 
return
[
  ["car","arc"],
  ["tea"],
  ["bee","eeb"]
]
* */

fun groupAnagrams(strs: Array<String>): List<List<String>> {
    val hashMap: Map<List<Char>, List<String>> = strs.groupBy { word: String -> word.toList().sorted() }
    return hashMap.map { it.value }
}