How to cleanup Mixamo bone names?

Hi, I'm trying out to clean up paths in animations so I can be worry-less about animation importing. I'd like to manipulate the original FBX file. In the worst case, I can import in scene rename objects and create a prefab.

I attached the script I tried. It goes over FBX bones but it doesn't really manipulate the file. Can someone suggest a better solution?

Code (csharp):

1.  
2. using UnityEngine;
3. using UnityEditor;
4. using System.Collections.Generic;
5. using System.Linq;
6. using UnityEditor.Animations;
7. using System.IO;
8.  
9. public class MixamoCleanFBX : MonoBehaviour
10. {
11.     [MenuItem("Assets/Mixamo clean bone names", true)]
12.     static public bool MixamoCleanValidate() => Selection.activeObject == null ? false : Path.GetExtension(AssetDatabase.GetAssetPath(Selection.activeObject)) == ".fbx";
13.  
14.     [MenuItem("Assets/Mixamo clean bone names")]
15.     static public void MixamoClean()
16.     {
17.         GameObject go = (GameObject)Selection.activeObject;
18.         if (go == null) { return; }
19.  
20.         UnityEngine.Object[] objects = AssetDatabase.LoadAllAssetsAtPath(AssetDatabase.GetAssetPath(Selection.activeObject));
21.         string newName;
22.         bool pastCol;
23.         foreach (UnityEngine.Object obj in objects)
24.         {
25.             if (obj.name.Contains("mixamorig"))
26.             {
27.                 newName = "";
28.                 pastCol = false;
29.                 for (int i = 0; i < obj.name.Length; i++)
30.                 {
31.                     if (pastCol)
32.                     {
33.                         newName += obj.name[i];
34.                     }
35.                     else if (obj.name[i] == ':') { pastCol = true; }
36.                 }
37.                 obj.name = newName;
38.                 Debug.Log(newName);
39.             }
40.         }
41.         EditorUtility.SetDirty(go);
42.         AssetDatabase.SaveAssets();
43.         AssetDatabase.Refresh();
44.  
45.     }
46. }
47.