diff --git a/script-sign-rs/src/main.rs b/script-sign-rs/src/main.rs
index bedb01c..93fd47f 100644
--- a/script-sign-rs/src/main.rs
+++ b/script-sign-rs/src/main.rs
@@ -3,9 +3,7 @@ use base64::engine::general_purpose::STANDARD as standard_base64;
 use base64::Engine;
 use digest::Digest;
 use regex::Regex;
-use rust_util::{
-    debugging, opt_result, opt_value_result, simple_error, util_cmd, XResult,
-};
+use rust_util::{debugging, opt_result, opt_value_result, simple_error, util_cmd, XResult};
 use serde::{Deserialize, Serialize};
 use sha2::Sha256;
 use std::collections::HashMap;
@@ -174,10 +172,20 @@ impl Script {
     }
 
     fn as_string(&self) -> String {
+        let mut joined_content_liens = self.content_lines.join("\n");
         match &self.signature {
-            None => self.content_lines.join("\n"),
+            None => joined_content_liens,
             Some(signature) => {
-                self.content_lines.join("\n") + "\n\n" + &signature.as_string() + "\n"
+                if joined_content_liens.ends_with("\n\n") {
+                    // SKIP add \n
+                } else if joined_content_liens.ends_with("\n") {
+                    joined_content_liens.push('\n');
+                } else {
+                    joined_content_liens.push_str("\n\n");
+                }
+                joined_content_liens.push_str(&signature.as_string());
+                joined_content_liens.push('\n');
+                joined_content_liens
             }
         }
     }
diff --git a/script-sign-rs/test.js b/script-sign-rs/test.js
index 6b69a81..7bfddab 100644
--- a/script-sign-rs/test.js
+++ b/script-sign-rs/test.js
@@ -1,4 +1,3 @@
 console.log('hello world');
 
-
-// @SCRIPT-SIGNATURE-V1: yk-r1.ES256.MEYCIQDA5+Em6mgx8F/D0Mu1JxhXtIs3nAQ/PCl7QZwO+6v+gwIhAK+mDCjGXqpKfhrZ/qvDKeHUgSgixpEKvkXPqLqpEtiQ
+// @SCRIPT-SIGNATURE-V1: yk-r1.ES256.MEUCIQDiGI8XkLHLcslt/663ZAIIBVItcRLMRZOJ7kBlP96QfgIgQtOeDbj5Z1+o4UkuXV1Knq0X8DRIOTNkVGmyBsJQ6f4=