updated downloader

internal/pkg/grib/util.go

@@ -6,25 +6,11 @@ import (
 	"time"
 )
 
-// Generate steps from 0 to 96 with step 3 hours (33 steps total)
-// GFS provides 3-hourly data for 0-120 hours, we use first 96 hours (0, 3, 6, ..., 96)
-var steps = func() []int {
-	result := make([]int, 0, 33)
-	for i := 0; i <= 96; i += 3 {
-		result = append(result, i)
-	}
-	return result
-}()
-
 func nearestRun(t time.Time) time.Time {
 	h := t.UTC().Hour() - t.UTC().Hour()%6
 	return time.Date(t.Year(), t.Month(), t.Day(), h, 0, 0, 0, time.UTC)
 }
 
-func fileName(run time.Time, step int) string {
-	return fmt.Sprintf("gfs.t%02dz.pgrb2.0p50.f%03d", run.Hour(), step)
-}
-
 func encodeKey(a ...any) uint64 {
 	h := fnv.New64a()
 	for _, v := range a {