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func caesarCypher(text:String, shiftNumber:Int) -> String {
    var encryptedText = ""

    let upperCaseArray:[String] = ["A","B", "C", "D", "E"]
    let lowerCaseArray = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", ""]]

    //You forgot characters
    for char in text.characters {
        if (char )
    }
}