BeforeUser2.kt

data class BeforeUser(
    val type: Type,
    val name: String,
    val address: String?,
    val phoneNumber: String?,
    val businessNumber: String?,
    val department: String?
) {
    enum class Type {
        CUSTOMER, STORE, ADMIN
    }

    fun toUser(): User =
        when (type) {
            Type.CUSTOMER -> User.Customer(name, address!!, phoneNumber!!)
            Type.STORE -> User.Store(name, address!!, businessNumber!!)
            Type.ADMIN -> User.Admin(name, department!!)
        }
}