[Swift] 이상한 문자 만들기

import Foundation

func solution(_ s:String) -> String {
    return s.components(separatedBy: " ").map {
        $0.enumerated().map {
            $0.offset % 2 == 0 ? $0.element.uppercased() : $0.element.lowercased()
        }
    }.map { $0.joined() }.joined(separator: " ")
}