construct a linked list from 2d matrix in golang

Go program for construct a linked list from 2d matrix. Here problem description and explanation.

package main
import "fmt"
// Go program for
// Construct a linked list from 2D matrix
type LinkNode struct {
	data int
	next * LinkNode
	down * LinkNode
}
func getLinkNode(data int) * LinkNode {
	// return new LinkNode
	return &LinkNode {data,nil,nil}
}
type DoublyLinkedList struct {
	head * LinkNode
}
func getDoublyLinkedList() * DoublyLinkedList {
	// return new DoublyLinkedList
	return &DoublyLinkedList {nil}
}
func(this DoublyLinkedList) display() {
	if this.head == nil {
		fmt.Print("Empty linked list")
	} else {
		var front * LinkNode = this.head
		var right * LinkNode = nil
		for (front != nil) {
			right = front
			for (right != nil) {
				fmt.Print(right.data, "  ")
				right = right.next
			}
			fmt.Print("\n")
			// Visit to down node
			front = front.down
		}
	}
}
func(this *DoublyLinkedList) insertData(matrix[][] int, 
	rows int, cols int) {
	// Some auxiliary variables
	var levelHead * LinkNode = nil
	var root * LinkNode = nil
	var perv * LinkNode = nil
	var i int = 0
	var j int = 0
	// Add first row elements into result list 
	for (i < cols) {
		if this.head == nil {
			// Add first node
			this.head = getLinkNode(matrix[0][i])
			levelHead = this.head
		} else {
			// next head
			levelHead.next = getLinkNode(matrix[0][i])
			levelHead = levelHead.next
		}
		i++
	}
	// Get first element    
	levelHead = this.head
	i = 1
	// Add all the bottom element of each column
	for (i < rows) {
		root = nil
		perv = root
		for (j < cols) {
			levelHead.down = getLinkNode(matrix[i][j])
			if root == nil {
				root = levelHead.down
				perv = root
			} else {
				perv.next = levelHead.down
				perv = levelHead.down
			}
			levelHead = levelHead.next
			j++
		}
		levelHead = root
		// reset col
		j = 0
		// change row
		i++
	}
}
func main() {
	var dll * DoublyLinkedList = getDoublyLinkedList()
	// Create 2D metrix
	var matrix = [][] int {
		{ 1, 6, 9, 2,  -9 },
    	{ 2, 5, -5, 7, 1 },
    	{ 3,  4, 1, 8, 2 }};
	var rows int = len(matrix)
	var cols int = len(matrix[0])
	dll.insertData(matrix, rows, cols)
	dll.display()
}

Output

  1  6  9  2 -9
  2  5 -5  7  1
  3  4 -1  8  2