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Swift 3 Trimming of special characters
extension String {
func trim(_ string: String) -> String {
var set = Set<Character>()
for c in string.characters {
set.insert(Character(String(c)))
}
return trim(set)
}
func trim(_ characters: Set<Character>) -> String {
if let index = self.characters.index(where: {!characters.contains($0)}) {
return self[index..<self.endIndex]
} else {
return ""
}
}
}
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