struct HikingStatistics {

    private let time: String?

    private let elevationUp: String?

    private let elevationDown: String?

    private let distance: String?

    private let calories: String?

    init(time: String?, elevationUp: String?, elevationDown: String?, distance: String?, calories: String?) {
        self.time = time
        self.elevationUp = elevationUp
        self.elevationDown = elevationDown
        self.distance = distance
        self.calories = calories
    }

    var content: String {
        var result = "<div class='stats-container'>"
        if let time {
            result += "<div><svg><use href='#icon-clock'></use></svg>\(time)</div>"
        }
        if let elevationUp {
            result += "<div><svg><use href='#icon-arrow-up'></use></svg>\(elevationUp)</div>"
        }
        if let elevationDown {
            result += "<div><svg><use href='#icon-arrow-down'></use></svg>\(elevationDown)</div>"
        }
        if let distance {
            result += "<div><svg><use href='#icon-sign'></use></svg>\(distance)</div>"
        }
        if let calories {
            result += "<div><svg><use href='#icon-flame'></use></svg>\(calories)</div>"
        }
        result += "</div>"
        return result
    }
}