formattingand autowired constructors (#2557)

# Description
This pull request includes several changes aimed at improving the code
structure and removing redundant code. The most significant changes
involve reordering methods, removing unnecessary annotations, and
refactoring constructors to use dependency injection.
Autowired now comes via constructor (which also doesn't need autowired
annotation as its done by default for configuration)



## Checklist

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [ ] My changes generate no new warnings
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

src/main/java/stirling/software/SPDF/utils/ProcessExecutor.java

@@ -1,10 +1,6 @@
 package stirling.software.SPDF.utils;
 
-import java.io.BufferedReader;
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.InterruptedIOException;
+import java.io.*;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
@@ -21,20 +17,17 @@ import stirling.software.SPDF.model.ApplicationProperties;
 @Slf4j
 public class ProcessExecutor {
 
-    private static ApplicationProperties applicationProperties = new ApplicationProperties();
-
-    public enum Processes {
-        LIBRE_OFFICE,
-        PDFTOHTML,
-        PYTHON_OPENCV,
-        WEASYPRINT,
-        INSTALL_APP,
-        CALIBRE,
-        TESSERACT,
-        QPDF
-    }
-
     private static final Map<Processes, ProcessExecutor> instances = new ConcurrentHashMap<>();
+    private static ApplicationProperties applicationProperties = new ApplicationProperties();
+    private final Semaphore semaphore;
+    private final boolean liveUpdates;
+    private long timeoutDuration;
+
+    private ProcessExecutor(int semaphoreLimit, boolean liveUpdates, long timeout) {
+        this.semaphore = new Semaphore(semaphoreLimit);
+        this.liveUpdates = liveUpdates;
+        this.timeoutDuration = timeout;
+    }
 
     public static ProcessExecutor getInstance(Processes processType) {
         return getInstance(processType, true);
@@ -135,16 +128,6 @@ public class ProcessExecutor {
                 });
     }
 
-    private final Semaphore semaphore;
-    private final boolean liveUpdates;
-    private long timeoutDuration;
-
-    private ProcessExecutor(int semaphoreLimit, boolean liveUpdates, long timeout) {
-        this.semaphore = new Semaphore(semaphoreLimit);
-        this.liveUpdates = liveUpdates;
-        this.timeoutDuration = timeout;
-    }
-
     public ProcessExecutorResult runCommandWithOutputHandling(List<String> command)
             throws IOException, InterruptedException {
         return runCommandWithOutputHandling(command, null);
@@ -271,6 +254,17 @@ public class ProcessExecutor {
         return new ProcessExecutorResult(exitCode, messages);
     }
 
+    public enum Processes {
+        LIBRE_OFFICE,
+        PDFTOHTML,
+        PYTHON_OPENCV,
+        WEASYPRINT,
+        INSTALL_APP,
+        CALIBRE,
+        TESSERACT,
+        QPDF
+    }
+
     public class ProcessExecutorResult {
         int rc;
         String messages;