TwinPrime

func isTwinPrime(_ number: Int) -> Bool {
    
    if number > 1 && !(2..<number).contains { number % $0 == 0 } {
        let lowerDifference = number - 2
        let higherDifference = number + 2
        if lowerDifference > 1 && !(2..<lowerDifference).contains { lowerDifference % $0 == 0 } {
            return true
        }
        if higherDifference > 1 && !(2..<higherDifference).contains { higherDifference % $0 == 0 } {
            return true
        }
    }
    
    return false
}