leetcode929

import java.util.HashSet;
import java.util.Set;

class Solution {
    public int numUniqueEmails(String[] emails) {
        Set<String> set = new HashSet<String>();
        for(String email:emails){
            //delete .
            //ignore +
            StringBuilder s = new StringBuilder();
            int index = email.indexOf('+');
            int at = email.indexOf('@');
            if (index!=-1){
                for (int i=0;i<index;i++){
                    if (email.charAt(i)!='.'){
                        s.append(email.charAt(i));
                    }
                }
            }else{
                for (int i=0;i<at;i++){
                    if (email.charAt(i)!='.'){
                        s.append(email.charAt(i));
                    }
                }
            }
            for (int i=at;i<email.length();i++){
                    s.append(email.charAt(i));
            }
            set.add(s.toString());
        }
        return set.size();

    }
}