Revert "fix checkstyle"

This reverts commit 7d26bb4.

Author: sobychacko

spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/catalog/FunctionAroundWrapper.java

@@ -20,6 +20,7 @@
 
 import org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry.FunctionInvocationWrapper;
 import org.springframework.messaging.Message;
+import org.springframework.util.StringUtils;
 
 /**
  * Wrapper that acts as around advise over function invocation.