[Swift 알고리즘] 직사각형 별찍기

https://programmers.co.kr/learn/courses/30/lessons/12969

import Foundation

let n = readLine()!.components(separatedBy: [" "]).map { Int($0)! }
let (a, b) = (n[0], n[1])


for _ in 0..<a{
    var star = ""
    for _ in 0..<b {
        star += "*"
    }
    print("\(star)")
}