func SumLinkedLists(l1, l2 *linkedlist.LinkedList) *linkedlist.LinkedList {
sum := linkedlist.New()
carry := 0
cur1, cur2 := l1.Root, l2.Root
for cur1 != nil && cur2 != nil {
total := cur1.Value + cur2.Value + carry
val := total % 10
carry = total / 10
sum.Add(val)
cur1 = cur1.Next
cur2 = cur2.Next
}
if cur1 != nil {
sum.Add(cur1.Value + carry)
} else if cur2 != nil {
sum.Add(cur2.Value + carry)
} else if carry > 0 {
sum.Add(carry)
}
return sum
}
func edgeCases(t *testing.T, testFunc q02Function) {
l := linkedlist.New()
n := testFunc(l, 1)
if n != nil {
t.Errorf("Failure with out of bounds K, zero length")
}
l.Add(1)
n = testFunc(l, 2)
if n != nil {
t.Errorf("Failure with out of bounds K, non-zero length")
}
n = testFunc(l, 0)
if n != nil {
t.Errorf("Failure with invalid K of 0")
}
n = testFunc(l, -1)
if n != nil {
t.Errorf("Failure with negative K")
}
}