use full file paths in file listing

goutil.go

@@ -2,6 +2,7 @@ package goutil
 
 import (
 	"io/ioutil"
+	"path"
 	"path/filepath"
 	"strings"
 )
@@ -28,7 +29,7 @@ func ListFilesExt(dir string, ext string) []string {
 		for _, file := range files {
 			if !file.IsDir() {
 				if strings.ToUpper(filepath.Ext(file.Name())) == ext {
-					list = append(list, file.Name())
+					list = append(list, path.Join(dir, file.Name()))
 				}
 			}
 		}