func (server msgServer) ChangeAdmin(goCtx context.Context, msg *types.MsgChangeAdmin) (*types.MsgChangeAdminResponse, error) {
	if err := msg.Validate(); err != nil {
		return nil, errors.Wrap(err, "failed to validate MsgChangeAdmin")
	}

	ctx := sdk.UnwrapSDKContext(goCtx)

	authorityMetadata, err := server.Keeper.GetAuthorityMetadata(ctx, msg.Denom)
	if err != nil {
		return nil, err
	}

	if msg.Sender != authorityMetadata.GetAdmin() {
		return nil, types.ErrUnauthorized.Wrapf("need: %s, received: %s, denom: %s", authorityMetadata.GetAdmin(), msg.Sender, msg.Denom)
	}

	err = server.Keeper.setAdmin(ctx, msg.Denom, msg.NewAdmin) // <------------
	if err != nil {
		return nil, err
	}
	ctx.EventManager().EmitEvents(sdk.Events{
		sdk.NewEvent(
			types.TypeMsgChangeAdmin,
			sdk.NewAttribute(types.AttributeDenom, msg.GetDenom()),
			sdk.NewAttribute(types.AttributeNewAdmin, msg.NewAdmin),
		),
	})

	return &types.MsgChangeAdminResponse{}, nil
}
if msg.NewAdmin == authorityMetadata.GetAdmin() {
	// Optionally, return an error or simply do nothing
}
