func tokenizer() {

    let initialStringToSend = "TranscribeGlass shows closed captions from any source in your field of view veryveryveryveryveryverylonglongword"
    let characterPerLine = 18


    func wrap(text: String, with maximumCharacterPerLine: Int) -> [String] {
        let components = text.components(separatedBy: .whitespacesAndNewlines)
        let output = components.reduce(into: [String]()) { result, word in
            guard let last = result.last else {
                result.append(word)
                return
            }
            let candidate = last + " " + word
            if candidate.count <= maximumCharacterPerLine {
                result[result.count - 1] = candidate
            } else if word.count <= maximumCharacterPerLine {
                result.append(word)
            } else {
                //Word is too big, we chunk it
                let chunks: [String] = stride(from: 0, to: word.count, by: maximumCharacterPerLine).map {
                    let start = word.index(word.startIndex, offsetBy: $0)
                    let end = word.index(start, offsetBy: maximumCharacterPerLine, limitedBy: word.endIndex) ?? word.endIndex
                    return String(word[start..<end])
                }
                chunks.forEach { result.append($0) }
            }
        }
        return output
    }

    let result = wrap(text: initialStringToSend, with: characterPerLine)
    print("Result:")
    result.forEach { print($0) }

    let expected = """
    TranscribeGlass
    shows closed
    captions from any
    source in your
    field of view
    """
    print("Expected:\n\(expected)")
}

Outputs:

Result:
TranscribeGlass
shows closed
captions from any
source in your
field of view
veryveryveryveryve
ryverylonglongword

Expected:
TranscribeGlass
shows closed
captions from any
source in your
field of view
//Side note, veryveryveryveryveryverylonglongword isn't in the expected output