Fixed error and updated jenkinsfile

jenkinsfile

@@ -3,6 +3,7 @@ pipeline {
 
     stages {
         stage('Build') {
+            cleanWs()
             steps {
             sh '''export PATH=$PATH:/usr/local/go/bin
             go build -o "HelloWorld-amd64$BUILD_DISPLAY_NAME"'''

main.go

@@ -4,5 +4,5 @@ import "fmt"
 
 func main() {
 	fmt.Println("Hello World 123")
-	fmt.Println("Hello World 123  
+	fmt.Println("This is a test")  
 }