how to get the child given their tags unity code example

Example: unity find gameobject with tag in child

public static class TransformExtensions     {         public static List<GameObject> FindObjectsWithTag(this Transform parent, string tag)         {             List<GameObject> taggedGameObjects = new List<GameObject>();              for (int i = 0; i < parent.childCount; i++)             {                 Transform child = parent.GetChild(i);                 if (child.tag == tag)                 {                     taggedGameObjects.Add(child.gameObject);                 }                 if (child.childCount > 0)                 {                     taggedGameObjects.AddRange(FindObjectsWithTag(child, tag));                 }             }             return taggedGameObjects;         }     }