Write function bmi that calculates body mass index (bmi = weight / height ^ 2). if bmi <= 18.5 return "Underweight" if bmi <= 25.0 return "Normal" if bmi <= 30.0 return "Overweight" if bmi > 30 return "Obese"

Calculate BMI #504

func bmi(_ weight: Int, _ height: Double) -> String {
    
    let bmi = Double(weight) / (height * height)
    
    
    if (bmi <= 18.5) {
        return "Underweight"
    }
        
    else if (bmi <= 25.0) {
        return "Normal"
    }
        
    else if (bmi <= 30.0) {
        return "Overweight"
    }
        
    else if (bmi > 30.0) {
        return "Obese"
    }
        
    else {
        return ""
    }
}