runtime error, index error, in create_index.go

[Erfanh1995]

1. Your code does not work on mac because you need an exception for ".DS_Store" file in line 99.
2. Also lines 103 and 104 should be changed to the following:
   fmt.Println(os.Args[1]+"/"+f.Name()+" trip ID: "+trip_id_str)
   file, _ := os.Open(os.Args[1]+"/"+f.Name())
3. finally the part bellow:
   if len(gps_trace) == 0 {
   fmt.Println("Warning, Trip is too short")
   continue
   }
   should come before line 138 otherwise if the trip is indeed too short you will get an index error before even printing that statement!