Question New command - Please help

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Is this code needed or was it to find a place to add the code ? I don’t have anything like it already

Code:
zone_rnum quest_zone(qst_rnum quest) { 
zone_rnum i; 
if  (quest == NOTHING) {   
return NOWHERE; 
}
  for (i = 0; i  < top_of_zone_table;  i++) { 
  if (QST_NUM(quest) >= zone_table.bot && QST_NUM(quest) <= zone_table.top) {     
return i;   
}
  }
  return NOWHERE;
}

Yes, that part is used in the function, and should be placed over the function.