[Programmers] 가장 큰 수

https://programmers.co.kr/learn/courses/30/lessons/42746

import Foundation

func solution(_ numbers:[Int]) -> String {
    let sortedNumbers: [Int] = numbers.sorted { Int("\($0)\($1)")! >  Int("\($1)\($0)")! }
    if sortedNumbers[0] == 0 {
        return "0"
    }
    var numbersStr: [String] = sortedNumbers.compactMap{ String($0) }
    let res = numbersStr.joined()
    return res
}