Merge pull request #8125 from eugenp/revert-8119-BAEL-3275-2

Revert "BAEL-3275: Using blocking queue for pub-sub"

testing-modules/junit-5/src/test/java/com/baeldung/StringUtils.java

@@ -0,0 +1,11 @@
+package com.baeldung;
+
+public final class StringUtils {
+
+    public static Double convertToDouble(String str) {
+        if (str == null) {
+            return null;
+        }
+        return Double.valueOf(str);
+    }
+}