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// Given an array of non-empty strings, return a Map<String, String> with a key for every different first character seen, with the value of all the strings starting with that character appended together in the order they appear in the array.

//

// firstChar(["salt", "tea", "soda", "toast"]) → {"s": "saltsoda", "t": "teatoast"}

// firstChar(["aa", "bb", "cc", "aAA", "cCC", "d"]) → {"a": "aaaAA", "b": "bb", "c": "cccCC", "d": "d"}

// firstChar([]) → {}

import java.util.Map;

import java.util.*;

public class FirstChar {

public static Map<String, String> firstChar(String[] strings) {

Map<String, String> result = new HashMap<String, String>();

return result;

}

public static void main(String[] args) {

String[] testArray = {"a","b","a","b"};

System.out.println(firstChar(testArray));

}

}