Chapter 6:15 updating 7th edition

Really having trouble getting this to work I’ve checked, double checked, tripled check, and checked some more if some would be so kind as to help me please

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Posting the offending code along with the error message, not an image, will help you get a better response.

For example:

class P64 {

extension P64 : CustomStringConvertible {
    var description: String {
        let v = "\(type (of:self)) is a math engine"
    } // <-- error: Missing return in a function expected to return 'String'