そっか、やっぱioutilを使わなくた方が良いらしいｗｗ

config.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-  "io/ioutil"
+  "os"
   "fmt"
   "runtime"
   "encoding/json"
@@ -31,7 +31,7 @@ func getconf () Config {
     cnf.configpath = prefix + cnf.configpath
   }
 
-  data, err := ioutil.ReadFile(cnf.configpath)
+  data, err := os.ReadFile(cnf.configpath)
   if err != nil {
     fmt.Println("エラー：", err)
   }

prep.go

@@ -7,7 +7,7 @@ import (
   "strings"
   "path/filepath"
   "net/http"
-  "io/ioutil"
+  "io"
 )
 
 func checkexist (url string, prefix string) []string {
@@ -54,9 +54,9 @@ func getpage (url string, path string) {
   }
 
   defer curl.Body.Close()
-  body, err2 := ioutil.ReadAll(curl.Body)
+  body, err2 := io.ReadAll(curl.Body)
   if err2 != nil {
-    fmt.Println("ioutilエラ：", err2)
+    fmt.Println("読込エラ：", err2)
     return
   }