Move vowels node at the beginning of linked list in golang

Go program for Move vowels node at the beginning of linked list. Here problem description and other solutions.

package main
import "fmt"
/*
  Go program for
  Shift the vowels node at beginning of linked list
*/
// Linked list node
type LinkNode struct {
	data byte
	next * LinkNode
}
func getLinkNode(data byte) * LinkNode {
	// return new LinkNode
	return &LinkNode {
		data,
		nil,
	}
}
type SingleLL struct {
	head * LinkNode
	tail * LinkNode
}
func getSingleLL() * SingleLL {
	// return new SingleLL
	return &SingleLL {
		nil,
		nil,
	}
}
// Add new node at end of linked list 
func(this *SingleLL) addNode(data byte) {
	var node * LinkNode = getLinkNode(data)
	if this.head == nil {
		this.head = node
	} else {
		// Append the node at last position
		this.tail.next = node
	}
	this.tail = node
}
// Display linked list element
func(this SingleLL) display() {
	if this.head == nil {
		fmt.Println("\n Empty linked list")
		return
	}
	var temp * LinkNode = this.head
	// iterating linked list elements
	for (temp != nil) {
		fmt.Printf(" %c →", temp.data)
		// Visit to next node
		temp = temp.next
	}
	fmt.Print(" NULL\n")
}
// Determine that given value is an vowel or not
func(this SingleLL) isVowels(value byte) bool {
	if value == 'a' || value == 'e' || 
	   value == 'i' || value == 'o' || 
	   value == 'u' || value == 'A' || 
	   value == 'E' || value == 'I' || 
	   value == 'O' || value == 'U' {
		return true
	}
	return false
}
// Move the vowels value at beginning position
func(this *SingleLL) shiftVowels() {
	if this.head == nil {
		fmt.Print("\n Empty linked list\n")
		return
	}
	// Define some auxiliary variable
	var node * LinkNode = this.head
	var back * LinkNode = nil
	// iterate linked list nodes
	// And shift vowels at front of linked list
	for (node != nil) {
		if this.isVowels(node.data) == true && back != nil {
			// Enter here when
			// Node is contain vowel and 
			// its previous (any) node is not form of vowel
			if node == this.tail {
				// When is last node
				// Set new last node
				this.tail = back
			}
			// Connect previous node to next node
			back.next = node.next
			// Connect vowel node to first node
			node.next = this.head
			// Set new head
			this.head = node
			// Get back node
			node = back
		} else {
			back = node
		}
		// Visit to next node
		node = node.next
	}
}
func main() {
	var sll * SingleLL = getSingleLL()
	// Constructed linked list
	sll.addNode('E')
	sll.addNode('D')
	sll.addNode('U')
	sll.addNode('C')
	sll.addNode('A')
	sll.addNode('T')
	sll.addNode('I')
	sll.addNode('O')
	sll.addNode('N')
	fmt.Println(" Before move vowels")
	// E → D → U → C → A → T → I → O → N → NULL
	sll.display()
	sll.shiftVowels()
	fmt.Println(" After move vowels")
	// O → I → A → U → E → D → C → T → N → NULL
	sll.display()
}

Output

 Before move vowels
 E → D → U → C → A → T → I → O → N → NULL
 After move vowels
 O → I → A → U → E → D → C → T → N → NULL