JAVA-2106: Move Java Convert PDF to Base64 to the pdf module

core-java-modules/core-java-string-operations-2/README.md

@@ -10,7 +10,6 @@ This module contains articles about string operations.
 - [Java String equalsIgnoreCase()](https://www.baeldung.com/java-string-equalsignorecase)
 - [Case-Insensitive String Matching in Java](https://www.baeldung.com/java-case-insensitive-string-matching)
 - [L-Trim and R-Trim Alternatives in Java](https://www.baeldung.com/java-trim-alternatives)
-- [Java Convert PDF to Base64](https://www.baeldung.com/java-convert-pdf-to-base64)
 - [Encode a String to UTF-8 in Java](https://www.baeldung.com/java-string-encode-utf-8)
 - [Guide to Character Encoding](https://www.baeldung.com/java-char-encoding)
 - [Convert Hex to ASCII in Java](https://www.baeldung.com/java-convert-hex-to-ascii) #remove additional readme file

pdf/README.md

@@ -6,3 +6,4 @@ This module contains articles about PDF files.
 - [PDF Conversions in Java](https://www.baeldung.com/pdf-conversions-java)
 - [Creating PDF Files in Java](https://www.baeldung.com/java-pdf-creation)
 - [Generating PDF Files Using Thymeleaf](https://www.baeldung.com/thymeleaf-generate-pdf)
+- [Java Convert PDF to Base64](https://www.baeldung.com/java-convert-pdf-to-base64)

pdf/src/test/java/com/baeldung/pdf/base64/EncodeDecodeUnitTest.java

@@ -1,8 +1,7 @@
 package com.baeldung.pdf.base64;
 
-import static org.junit.Assert.assertArrayEquals;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotEquals;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
@@ -11,8 +10,7 @@ import java.io.OutputStream;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 
-import org.junit.BeforeClass;
-import org.junit.Test;
+import static org.junit.Assert.*;
 
 public class EncodeDecodeUnitTest {