Insert at end inplace

Insert at end inplace.go

func InsertAtEndInPlace(head **Node, x int) {
	tmp := Node{Next: nil, Data: x}
	if *head == nil {
		*head = &tmp
	} else {
		var p *Node
		p = *head
		for ; p.Next != nil; p = p.Next {
		}
		p.Next = &tmp
	}
}