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class Solution {
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  public int numUniqueEmails(String[] emails) {
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    Set<String> finalEmails = new HashSet<>();
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    for (String email : emails) {
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      StringBuilder name = new StringBuilder();
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      boolean ignore = false;
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      for (int i = 0; i < email.length(); i++) {
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        char c = email.charAt(i);
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        switch (c) {
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          case '.':
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            break;
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          case '+':
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            ignore = true;
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            break;
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          case '@':
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            name.append(email.substring(i));
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            i = email.length();
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            break;
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          default:
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            if (!ignore) name.append(c);
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        }
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      }
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      finalEmails.add(name.toString());
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    }
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    finalEmails.forEach(System.out::println);
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    return finalEmails.size();
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  }
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}