# Question

Implement the function `retrieveAddress` using the methods `getStreet1`, `getStreet2`, and `getStreet3` to create an `Address`.

case class Address(
  street1: String,
  street2: Option[String],
  street3: Option[String]
)

def retrieveAddress: Option[Address] = {
    val street1: Option[String] = Try(getStreet1).fold(
        t => None,
        street => Some(street)
    );
    
    street1 match {
        case None => None
        case Some(street) => Some(Address(street, Try(getStreet2).toOption , Try(getStreet3).toOption))
    }    
}

sealed trait Try[+A]

case class Success[+A](a: A) extends Try[A]
case class Failure[+A](a: Throwable) extends Try[A]


// =======================================================================  
// LIBRARY METHODS 
// =======================================================================

/**
  * Retrieves the main street address.
  * @throws RuntimeException if empty
  */
def getStreet1: String = {
  // implementation
  
}

/**
  * Retrieves additional street address line 2.
  * @throws RuntimeException if empty
  */
def getStreet2: String = {
  // implementation
}

/**
  * Retrieves additional street address line 3.
  * @throws RuntimeException if empty
  */
def getStreet3: String = {
  // implementation
}