StringBuilder result = new StringBuilder();
for (char character : message.toCharArray()) {
    if (character != ' ') {
        int originalAlphabetPosition = character - 'a';
        int newAlphabetPosition = (originalAlphabetPosition + offset) % 26;
        char newCharacter = (char) ('a' + newAlphabetPosition);
        result.append(newCharacter);
    } else {
        result.append(character);
    }
}
return result;
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