Here's a solution in Julia:

```vbnet
# Definition for singly-linked list.
struct ListNode
    val::Int64
    next::Union{Nothing, ListNode}
end

function addTwoNumbers(l1::ListNode, l2::ListNode)
    dummy = ListNode(0, nothing)
    curr = dummy
    carry = 0
    while (l1 != nothing) || (l2 != nothing)
        x = (l1 != nothing) ? l1.val : 0
        y = (l2 != nothing) ? l2.val : 0
        sum = carry + x + y
        carry = sum >= 10 ? 1 : 0
        curr.next = ListNode(sum % 10, nothing)
        curr = curr.next
        l1 = (l1 != nothing) ? l1.next : nothing
        l2 = (l2 != nothing) ? l2.next : nothing
    end
    if carry > 0
        curr.next = ListNode(carry, nothing)
    end
    return dummy.next
end
```
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