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You can do everything inside your odomCallback function

void OdomToTransform::odomCallback(const nav_msgs::OdometryConstPtr& msg) {
   geometry_msgs::TransformStamped tf_stamped;

   tf_stamped.header = msg.header;
   tf_stamped.child_frame_id = msg.child_frame_id;
   tf_stamped.transform.translation.x = msg.pose.pose.position.x;
   tf_stamped.transform.translation.y = msg.pose.pose.position.y;
   tf_stamped.transform.translation.z = msg.pose.pose.position.z;
   tf_stamped.transform.rotation = msg.pose.pose.orientation;

   transform_pub_.publish(tf_stamped); 

}

You can do everything inside your odomCallback function

void OdomToTransform::odomCallback(const nav_msgs::OdometryConstPtr& msg) nav_msgs::Odometr &msg) {
   geometry_msgs::TransformStamped tf_stamped;

   tf_stamped.header = msg.header;
   tf_stamped.child_frame_id = msg.child_frame_id;
   tf_stamped.transform.translation.x = msg.pose.pose.position.x;
   tf_stamped.transform.translation.y = msg.pose.pose.position.y;
   tf_stamped.transform.translation.z = msg.pose.pose.position.z;
   tf_stamped.transform.rotation = msg.pose.pose.orientation;

   transform_pub_.publish(tf_stamped); 

}

You can do everything inside your odomCallback function

void OdomToTransform::odomCallback(const nav_msgs::Odometr nav_msgs::Odometry &msg) {
   geometry_msgs::TransformStamped tf_stamped;

   tf_stamped.header = msg.header;
   tf_stamped.child_frame_id = msg.child_frame_id;
   tf_stamped.transform.translation.x = msg.pose.pose.position.x;
   tf_stamped.transform.translation.y = msg.pose.pose.position.y;
   tf_stamped.transform.translation.z = msg.pose.pose.position.z;
   tf_stamped.transform.rotation = msg.pose.pose.orientation;

   transform_pub_.publish(tf_stamped); 

}

You can do everything inside your odomCallback function

void OdomToTransform::odomCallback(const nav_msgs::Odometry &msg) {
   odometry_ = msg;

   geometry_msgs::TransformStamped tf_stamped;

   tf_stamped.header = msg.header;
odometry_.header;
   tf_stamped.child_frame_id = msg.child_frame_id;
odometry_.child_frame_id;
   tf_stamped.transform.translation.x = msg.pose.pose.position.x;
odometry_.pose.pose.position.x;
   tf_stamped.transform.translation.y = msg.pose.pose.position.y;
odometry_.pose.pose.position.y;
   tf_stamped.transform.translation.z = msg.pose.pose.position.z;
odometry_.pose.pose.position.z;
   tf_stamped.transform.rotation = msg.pose.pose.orientation;
odometry_.pose.pose.orientation;

   transform_pub_.publish(tf_stamped); 

}