JointState message

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void callback(const sensor_msgs::JointState::ConstPtr& msg)

{

 sensor_msgs::JointState output;

 output.name=msg->name; 

 output.position=msg->position;

 output.header=msg->header;

 pub_.publish(output);

}

the topic i subscribe is “Joint_states”

the msg->name=[‘Joint0’，‘Joint1’，‘Joint2’，‘Joint3’，‘Joint4’，‘Joint5’]

i want to make the array output.name=[Joint0]

i try to write output.name=“Joint0” but when complile there is an error or output.name=msg->name[0] also the same problem

is the size of array "output.name" is fixed cause the error