Duplicates.java

import java.util.HashMap;
import java.util.Map;

    class Duplicates {
        public static Map<Character, Integer> countDuplicateCharacters(String string) {
            var resultMap = new HashMap<Character, Integer>();
            var tempMap = new HashMap<Character,Integer>();
            // write your code here ...
           string= string.toUpperCase();
            char [] temp=string.toCharArray();
            for (int i = 0; i <temp.length ; i++) {
                int count = 0;
                if (tempMap.containsKey(temp[i])) {
                    count = tempMap.get(temp[i]);
                }
                    tempMap.put(temp[i], ++count);
            }
            for (char i:tempMap.keySet()) {
                int count = 0;
                    if(tempMap.containsKey(i)) {
                        count = tempMap.get(i);

                        if (count > 1)
                            resultMap.put(i,count);
                    }
            }
            return resultMap;
        }

        public static void main(String[] args) {
            String message = "Competitive Programming Can Be A Little Bit Tricky!";
            System.out.println(countDuplicateCharacters(message));
        }
    }