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- extension String {
- func pyramid() -> String {
- var result = ""
- for index in 1..<characters.count {
- result.append(contentsOf: self.characters.prefix(index))
- result.append("\n")
- }
- for index in stride(from: characters.count, to: 0, by: -1) {
- result.append(contentsOf: self.characters.prefix(index))
- result.append("\n")
- }
- return result
- }
- }
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