Swift strict Base64 encode and decode

import Foundation

enum Base64Error: Error { case invalidInput }

func encodeBase64(_ text: String) -> String {
    Data(text.utf8).base64EncodedString()
}

func decodeBase64(_ encoded: String) throws -> String {
    let cleaned = encoded.replacingOccurrences(of: "\n", with: "")
        .replacingOccurrences(of: " ", with: "")
    guard let data = Data(base64Encoded: cleaned),
          let text = String(data: data, encoding: .utf8) else {
        throw Base64Error.invalidInput
    }
    return text
}