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String htmlEndTagByStartTag(String startTag) {
    int pos = startTag.indexOf('<');
    int first = pos + 1;
    while (startTag.charAt(first) == ' ') first++;
    int end = first + 1;
    while (startTag.charAt(end) != ' ' && startTag.charAt(end) != '>') end++;
    return "</" + startTag.substring(first, end).trim() + ">";
}