1. Input – 1.1.1.1 Output – 1[.]1[.]1[.]1[.]

    string ipAddr(string address) {
        string result;
        for (int i = 0; i< address.length(); i++){
            if(address[i] == '.'){
                result.append("[.]");
            }
            else{
                result += address[i]; 
            }
        }
        return result;
    }

2. Reverse Words in a String – Input [the sky is blue], Output – [blue is sky the]

string reverseWords(string s) {
        
        // Reverse the whole string 
        reverse(s, 0, s.length()-1);
        
        int st = 0;
        // Reverse each word 
        while(st <= s.length()){
            int word_st = st;       
            while(s[st] != ' ' && st < s.length()){
                st++;
            }
            int word_en = st - 1;
            reverse(s, word_st, word_en);
            st++;        
        }
        return s;    
    }
    void reverse(string &s, int st, int en){
        int length = en - st + 1;
        while(st<= en){
            char temp  = s[en];
            s[en] = s[st];
            s[st] = temp;
            st++;
            en--;
        }