formatting work

junit5/src/test/java/com/baeldung/StringUtils.java

@@ -2,10 +2,10 @@ package com.baeldung;
 
 public final class StringUtils {
 
-	public static Double convertToDouble(String str) {
-		if (str == null) {
-			return null;
-		}
-		return Double.valueOf(str);
-	}
+    public static Double convertToDouble(String str) {
+        if (str == null) {
+            return null;
+        }
+        return Double.valueOf(str);
+    }
 }