diff --git a/strings.go b/strings.go
index 264384e..3a8c433 100644
--- a/strings.go
+++ b/strings.go
@@ -301,7 +301,7 @@ func RuneReverse(s string) string {
 // Reverse 反转字符串
 func Reverse(s string) string {
 	b := []byte(s)
-	for i, j := 0, len(b)-1; i < len(b)/2; i, j = i+1, j-1 {
+	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
 		b[i], b[j] = b[j], b[i]
 	}
 	return B2S(b)
diff --git a/xfile/utils.go b/xfile/utils.go
index e535bba..8a35475 100644
--- a/xfile/utils.go
+++ b/xfile/utils.go
@@ -72,7 +72,7 @@ func ReadLines(filename string) ([]string, error) {
 func ReadLinesOffsetN(filename string, offset uint, n int) ([]string, error) {
 	f, err := os.Open(filename)
 	if err != nil {
-		return []string{""}, err
+		return nil, err
 	}
 	defer func() {
 		_ = f.Close()