I’m a starter for Swift. Recently I met a problem with structure. Can anybody help me?

What does the warnning suppose to mean? I don’t quite get what’s wrong with my codes.

struct RunningWorkout {
    var distance: Double
    var time: Double
    var elevation: Double
    func postWorkoutStats()  {
        print(distance, time, elevation)

let kkkk = RunningWorkout(distance: 444, time: 3.45, elevation: 9.89)
var gg = kkkk.postWorkoutStats()

In line12 the compiler complaint is “Variable ‘gg’ inferred to have type ‘()’, which may be unexpected” What does it mean? Anybody knows that? Thanks

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