Fix pmd, add missing test classes for typeres

pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/performance/StringToStringRule.java

@@ -285,8 +285,7 @@ public class StringToStringRule extends AbstractJavaRule {
     private Class<?> getMethodReturnType(ASTMethodDeclaration method) {
         ASTType returnType = method != null ? method.getResultType().getFirstDescendantOfType(ASTType.class) : null;
         if (returnType != null) {
-            Class<?> type = returnType.getType();
+            return returnType.getType();
-            return type;
         }
         return null;
     }

pmd-java/src/test/java/net/sourceforge/pmd/lang/java/rule/performance/stringtostring/Car.java

@@ -0,0 +1,9 @@
+/*
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
+package net.sourceforge.pmd.lang.java.rule.performance.stringtostring;
+
+public class Car {
+
+}

pmd-java/src/test/java/net/sourceforge/pmd/lang/java/rule/performance/stringtostring/User.java

@@ -0,0 +1,9 @@
+/*
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
+package net.sourceforge.pmd.lang.java.rule.performance.stringtostring;
+
+public class User {
+
+}