go: add «328. Odd Even Linked List»

Signed-off-by: Matej Focko <me@mfocko.xyz>

go/odd-even-linked-list.go

@@ -0,0 +1,17 @@
+package main
+
+func oddEvenList(head *ListNode) *ListNode {
+	dummies := []ListNode{ListNode{Val: 0, Next: nil}, ListNode{Val: 0, Next: nil}}
+	tails := []*ListNode{&dummies[0], &dummies[1]}
+
+	for idx := 0; head != nil; idx++ {
+		tails[idx%2].Next = head
+		tails[idx%2] = head
+
+		head = head.Next
+	}
+
+	tails[0].Next = dummies[1].Next
+	tails[1].Next = nil
+	return dummies[0].Next
+}