diff --git a/tutorials/katacoda/case-get-spring-context-cn/case-get-spring-context.md b/tutorials/katacoda/case-get-spring-context-cn/case-get-spring-context.md
index 34651f408..c689020e6 100644
--- a/tutorials/katacoda/case-get-spring-context-cn/case-get-spring-context.md
+++ b/tutorials/katacoda/case-get-spring-context-cn/case-get-spring-context.md
@@ -51,4 +51,4 @@ Affect(row-cnt:1) cost in 439 ms.
 $ tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'
 @String[Hello World]
 Affect(row-cnt:1) cost in 52 ms.
-```
\ No newline at end of file
+```
diff --git a/tutorials/katacoda/case-get-spring-context-en/case-get-spring-context.md b/tutorials/katacoda/case-get-spring-context-en/case-get-spring-context.md
index 839d67867..0deb22dfc 100644
--- a/tutorials/katacoda/case-get-spring-context-en/case-get-spring-context.md
+++ b/tutorials/katacoda/case-get-spring-context-en/case-get-spring-context.md
@@ -51,4 +51,4 @@ The result is:
 $ tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'
 @String[Hello World]
 Affect(row-cnt:1) cost in 52 ms.
-```
\ No newline at end of file
+```
diff --git a/tutorials/katacoda/case-http-404-cn/case-http-404.md b/tutorials/katacoda/case-http-404-cn/case-http-404.md
index 79abcb7e3..16219f9c3 100644
--- a/tutorials/katacoda/case-http-404-cn/case-http-404.md
+++ b/tutorials/katacoda/case-http-404-cn/case-http-404.md
@@ -36,4 +36,4 @@ Something went wrong: 404 Not Found
     |   `---[0.068578ms] javax.servlet.GenericServlet:init()
     |       `---[0.021793ms] javax.servlet.GenericServlet:init()
     `---[0.164035ms] javax.servlet.GenericServlet:getServletContext()
-```
\ No newline at end of file
+```
diff --git a/tutorials/katacoda/case-http-404-en/case-http-404.md b/tutorials/katacoda/case-http-404-en/case-http-404.md
index b7e1d1c25..8f25c7c8c 100644
--- a/tutorials/katacoda/case-http-404-en/case-http-404.md
+++ b/tutorials/katacoda/case-http-404-en/case-http-404.md
@@ -36,4 +36,4 @@ It can be found that the request is handled by `freemarker`:
     |   `---[0.068578ms] javax.servlet.GenericServlet:init()
     |       `---[0.021793ms] javax.servlet.GenericServlet:init()
     `---[0.164035ms] javax.servlet.GenericServlet:getServletContext()
-```
\ No newline at end of file
+```
diff --git a/tutorials/katacoda/command-sc-cn/sc.md b/tutorials/katacoda/command-sc-cn/sc.md
index c4a8b01fb..6c6cf194c 100644
--- a/tutorials/katacoda/command-sc-cn/sc.md
+++ b/tutorials/katacoda/command-sc-cn/sc.md
@@ -109,4 +109,5 @@
 
 
   Affect(row-cnt:1) cost in 19 ms.
-  ```
\ No newline at end of file
+  ```
+  
\ No newline at end of file
diff --git a/tutorials/katacoda/command-sm-cn/sm.md b/tutorials/katacoda/command-sm-cn/sm.md
index 0bd8ab384..6957abb79 100644
--- a/tutorials/katacoda/command-sm-cn/sm.md
+++ b/tutorials/katacoda/command-sm-cn/sm.md
@@ -113,4 +113,4 @@ $ sm -d java.lang.String toString
  exceptions
 
 Affect(row-cnt:1) cost in 3 ms.
-```
\ No newline at end of file
+```
diff --git a/tutorials/katacoda/command-sm-en/sm.md b/tutorials/katacoda/command-sm-en/sm.md
index 4e0e5a84f..586b8d35d 100644
--- a/tutorials/katacoda/command-sm-en/sm.md
+++ b/tutorials/katacoda/command-sm-en/sm.md
@@ -112,4 +112,4 @@ $ sm -d java.lang.String toString
  exceptions
 
 Affect(row-cnt:1) cost in 3 ms.
-```
\ No newline at end of file
+```