move sieves to subpackage

cmd/radical.go

@@ -22,7 +22,7 @@ import (
 	"os"
 
 	"github.com/spf13/cobra"
-	"scm.dairydemon.net/filifa/mathtools/internal/lib"
+	"scm.dairydemon.net/filifa/mathtools/internal/lib/sieve"
 )
 
 var radicalN uint
@@ -31,7 +31,7 @@ func radical(cmd *cobra.Command, args []string) {
 	bufStdout := bufio.NewWriter(os.Stdout)
 	defer bufStdout.Flush()
 
-	ch := lib.RadicalSieve(radicalN, 1000)
+	ch := sieve.RadicalSieve(radicalN, 1000)
 	for i := 0; ; i++ {
 		v, ok := <-ch
 		if !ok {