follow path A*

using UnityEngine;
using System.Collections.Generic;
using System.Linq;
using System.Collections;

public class AIEn : MonoBehaviour
{

    public List<GameObject> open_list = new List<GameObject>(); //lista dei nodes che devono essere considerati per trovare il percorso
    public List<GameObject> closed_list = new List<GameObject>(); //lista dei nodes già considerati
    public List<GameObject> adjacent_nodes = new List<GameObject>();
    public List<GameObject> path_nodes = new List<GameObject>(); //i nodes nella path finale
    public GameObject target;
    public GameObject my_node;
    GetClosestNode targ_node;
    GetClosestNode actual_node;
    NodeManager node_manager;
    EnemyVars en_vars;

    RaycastHit2D ray_dx;
    RaycastHit2D ray_sx;
    RaycastHit2D ray_up;
    RaycastHit2D ray_down;

    public int current_node = 0;
    float node_dist;
    Vector3 dest;

    void Update()
    {

        ....
            //found a way
            if (closed_list.Contains(targ_node.my_node))
            {
                BackTracePath();
                FollowPath();
            }
            ....
    }

    #region path follow
    void FollowPath()
    {
        dest = GetNodePos(current_node);
        node_dist = Vector2.Distance(transform.position, dest);

        if (node_dist>0.3f)
        {
            Debug.Log(node_dist);
            transform.position = Vector3.MoveTowards(transform.position, dest, en_vars.speed * Time.deltaTime);
            transform.rotation= UtilityFunctions.FaceTo(GetNodePos(current_node), transform.position);
        }
        else
        {
            ChangePathNode();
        }

    }

    Vector3 GetNodePos(int n_node)
    {
        return path_nodes[n_node].transform.position;
    }

    void ChangePathNode()
    {
        current_node++;
        if(current_node>=path_nodes.Count)
        {
            current_node = 0;
        }
    }
    #endregion
}