Cannot edit text file.

Hi, I have a problem, file is creating, but text in it not, how can I fix that?

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 using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  using System.IO;
  
  public class Save_Load : MonoBehaviour {
  
      public string saveFilePath;
  
      void Start () {
          Directory.CreateDirectory(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + "/My Games");
          Directory.CreateDirectory(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + "/My Games/ProjectDrive");
          Save(); //for test
      }
      
      void Update () {
  
      }
  
      void Save()
      {
          var Car = GameObject.FindGameObjectWithTag("Car");
  
          if (!File.Exists(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + "/My Games/ProjectDrive/Save.txt"))
          {
              File.CreateText(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + @"/My Games/ProjectDrive/Save.txt");
              saveFilePath = (System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + @"/My Games/ProjectDrive/Save.txt");
              StreamWriter writer = new StreamWriter(saveFilePath, true);
                  writer.WriteLine(Car.transform.position.x.ToString());
                  writer.WriteLine(Car.transform.position.x.ToString());
                  writer.WriteLine(Car.transform.position.x.ToString());
  
                  writer.WriteLine(Car.transform.rotation.x.ToString());
                  writer.WriteLine(Car.transform.rotation.x.ToString());
                  writer.WriteLine(Car.transform.rotation.x.ToString());
  
               writer.Close();
  
          }
  
          if (File.Exists(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + "/My Games/ProjectDrive/Save.txt"))
          {
              File.Delete(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + @"/My Games/ProjectDrive/Save.txt");
              File.CreateText(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + @"/My Games/ProjectDrive/Save.txt");
              saveFilePath = (System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments).ToString() + @"/My Games/ProjectDrive/Save.txt");
  
              StreamWriter writer = new StreamWriter(saveFilePath, true);
              
                  writer.WriteLine(Car.transform.position.x.ToString());
                  writer.WriteLine(Car.transform.position.x.ToString());
                  writer.WriteLine(Car.transform.position.x.ToString());
  
                  writer.WriteLine(Car.transform.rotation.x.ToString());
                  writer.WriteLine(Car.transform.rotation.x.ToString());
                  writer.WriteLine(Car.transform.rotation.x.ToString());
  
               writer.Close();
          }
      }
  }