Prefix

[SeRG1k17]

Why this:

        guard rgba.hasPrefix("#") else {
            throw UIColorInputError.missingHashMarkAsPrefix
        }
        
        let hexString: String = String(rgba[String.Index.init(encodedOffset: 1)...])
//...

Not:

        var hexString = rgba
        if hexString.hasPrefix("#") {
            hexString = String(hexString.dropFirst())
        }
//...

[yeahdongcn]

Thank you for fixing this.