Bending a stick problem (Probably easy for an intermediate programmer)

Here is the code I used to bend a mesh object: public class Bend : MonoBehaviour { public enum BendAxis {X, Y, Z};

  public float rotate = 90;
  public float fromPosition = 0.5F; //from 0 to 1
  public BendAxis axis = BendAxis.X;
  Mesh mesh;
  Vector3[] vertices;
  
  void Start()
  {
      mesh = GetComponent<MeshFilter>().mesh;
      vertices = mesh.vertices;
 
      if (axis == BendAxis.X)
      {
          float meshWidth = mesh.bounds.size.z;
          for (var i = 0; i < vertices.Length; i++)
          {
              float formPos = Mathf.Lerp(meshWidth / 2, -meshWidth / 2, fromPosition);
              float zeroPos = vertices[i].z + formPos;
              float rotateValue = (-rotate / 2) * (zeroPos / meshWidth);
              
              zeroPos -= 2 * vertices[i].x * Mathf.Cos ((90 - rotateValue) * Mathf.Deg2Rad);
              
              vertices[i].x += zeroPos * Mathf.Sin(rotateValue * Mathf.Deg2Rad);
              vertices[i].z = zeroPos * Mathf.Cos(rotateValue * Mathf.Deg2Rad) - formPos;
          }
      }
      else if (axis == BendAxis.Y)
      {
          float meshWidth = mesh.bounds.size.z;
          for (var i = 0; i < vertices.Length; i++)
          {
              float formPos = Mathf.Lerp(meshWidth / 2, -meshWidth / 2, fromPosition);
              float zeroPos = vertices[i].z + formPos;
              float rotateValue = (-rotate / 2) * (zeroPos / meshWidth);
              
              zeroPos -= 2 * vertices[i].y * Mathf.Cos ((90 - rotateValue) * Mathf.Deg2Rad);
              
              vertices[i].y += zeroPos * Mathf.Sin(rotateValue * Mathf.Deg2Rad);
              vertices[i].z = zeroPos * Mathf.Cos(rotateValue * Mathf.Deg2Rad) - formPos;
          }
      }
      else if (axis == BendAxis.Z)
      {
          float meshWidth = mesh.bounds.size.x;
          for (var i = 0; i < vertices.Length; i++)
          {
              float formPos = Mathf.Lerp(meshWidth / 2, -meshWidth / 2, fromPosition);
              float zeroPos = vertices[i].x + formPos;
              float rotateValue = (-rotate / 2) * (zeroPos / meshWidth);
              
              zeroPos -= 2 * vertices[i].y * Mathf.Cos ((90 - rotateValue) * Mathf.Deg2Rad);
 
              vertices[i].y += zeroPos * Mathf.Sin(rotateValue * Mathf.Deg2Rad);
              vertices[i].x = zeroPos * Mathf.Cos(rotateValue * Mathf.Deg2Rad) - formPos;
          }
      }
 
      mesh.vertices = vertices;
      mesh.RecalculateBounds ();
  }

}

It seems to be bending from only one side and even when I change fromPosition it doesn't seem to be bending.