Try the AI approach

src/com/thejimnicholson/Versioner.groovy

@@ -1,6 +0,0 @@
-
-class Versioner {
-
-
-
-}

vars/printBanner.groovy

@@ -1,6 +1,9 @@
-void printBanner(String anything) {
-    boxCorner = '+'
-    repetitions = anything.length() + 2
-    boxTop = boxCorner + '=' * repetitions + boxCorner
-    echo "${boxTop}\n| ${anything} |\n${boxTop}\n"
+def printStepBanner(stepName) {
+    def bannerWidth = stepName.length() + 6
+    def banner = "+${'-'.multiply(bannerWidth)}+"
+    def stepBanner = "|  $stepName  |"
+
+    echo banner
+    echo stepBanner
+    echo banner
 }