Sandbox::https://github.com/prashanthigupta/leetcode-algorithms/blob/master/src/UniqueEmailAddresses.java

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import java.util.HashSet;

import java.util.Set;

public class UniqueEmailAddresses {

public int numUniqueEmails(String[] emails) {

Set<String> uniqueEmails = new HashSet<>();

for (String emailAddress : emails) {

uniqueEmails.add(getActualEmailAddress(emailAddress));

}

return uniqueEmails.size();

}

private static String getActualEmailAddress(String email) {

StringBuilder result = new StringBuilder();

for (int index = 0 ; index < email.length() ; index++) {

if (email.charAt(index) == '+') {

while (email.charAt(index) != '@') index++;

result.append(email.substring(index));

break;

} else if (email.charAt(index) == '@') {

result.append(email.substring(index));

break;

} else if (email.charAt(index) != '.') result.append(email.charAt(index));

}

return result.toString();

}