// Enter your code below
extension String {
  func transform(_ function: (String) -> String) -> String {
    return function(self)
  }
}

extension Character {
    var isVowel: Bool {
        let vowels: [Character] = ["a", "e", "i", "o", "u"]
        return vowels.contains(self)
    }
}

func removeVowels(from string: String) -> String {
    var newString = ""
    for char in string.characters {
        if char.isVowel {
            newString += String(char)
        }
    }
    return newString
}