CodingBat/Java/Map-2/Pairs.java at master · pauldpearson/CodingBat · GitHub

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Given an array of non-empty strings, create and return a Map<String, String> as follows: for each string add its first character as a key with its last character as the value.
pairs(["code", "bug"]) → {"b": "g", "c": "e"}
pairs(["man", "moon", "main"]) → {"m": "n"}
pairs(["man", "moon", "good", "night"]) → {"g": "d", "m": "n", "n": "t"}
public class Pairs {