static boolean isAnagram(String a, String b) {
        int[] charCount=new int[26];
        for(char ch:a.toCharArray()){
            charCount[Character.toLowerCase(ch) - 'a']++;
        }
        for(char ch:b.toCharArray()){
            charCount[Character.toLowerCase(ch)-'a']--;
        }
        
        for(int count:charCount){
            if(count!=0) return false;
        }
        return true;
    }