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; Copy