CharacterExtension.swift

extension Character {
    var uppercaseCharacter: Character {
        return Character(String(self).uppercaseString)
    }
    
    var lowercaseCharacter: Character {
        return Character(String(self).lowercaseString)
    }
    
    func isUppercaseCharacter() -> Bool {
        return self == self.uppercaseCharacter
    }
    
    func isLowercaseCharacter() -> Bool {
        return self == self.lowercaseCharacter
    }
}