remove unused function

activity.go

@@ -19,7 +19,6 @@ import (
 	"bytes"
 	"compress/gzip"
 	"crypto/rsa"
-	"crypto/sha256"
 	"database/sql"
 	"encoding/json"
 	"fmt"
@@ -180,13 +179,6 @@ func jsongetmap(j interface{}, key string) (map[string]interface{}, bool) {
 	return jsonfindmap(j, []string{key})
 }
 
-func sha256string(s string) string {
-	hasher := sha256.New()
-	io.WriteString(hasher, s)
-	sum := hasher.Sum(nil)
-	return fmt.Sprintf("%x", sum)
-}
-
 func savedonk(url string, name, media string) *Donk {
 	log.Printf("saving donk: %s", url)
 	var donk Donk