Struct userModel {
var firstName: String
var lastName: String
var userID: int
var weight: float?
var age: int?
var email: String
var country: String?
var height: float?
var goalWeight: float?
Init( fname: String, lname: String, ID: Int, userWeight: float?, userAge: int?, userEmail: String, userCountry: String?, userHeight: float?,  userGoalWeight: float?){
self.firstName = fname
self.lastName = lname
self.userID = ID
self.weight = userWeight
self.age = userAge
self.email = userEmail
self.country = userCountry
self.height = userHeight
self.goalWeight = userGoalWeight
}


}

Extention userModel{
func validateUserForLogin(username: String,  password: String) -> Bool{
//check the username and password against a database
If username && password {
//if the password is good to go return true
Return true
}else{
//Display popup error
Return false
}
}
Mutating func update(userWeight: float){
Self.weight = userWeight
}
Mutating func update(userHeight: float){
    Self.height = userHeight
}
}