Added more Methods

src/main/java/dev/unlegitdqrk/unlegitlibrary/file/FileUtils.java

@@ -10,7 +10,9 @@ import java.nio.file.LinkOption;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
+import java.util.Locale;
 import java.util.stream.Stream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
@@ -122,6 +124,17 @@ public final class FileUtils extends DefaultMethodsOverrider {
         return new String(content, StandardCharsets.UTF_8);
     }
 
+    private static List<File> listFiles(File dir, String... exts) {
+        if (!dir.exists()) return List.of();
+        File[] files = dir.listFiles((d, name) -> {
+            for (String ext : exts) {
+                if (name.toLowerCase(Locale.ROOT).endsWith(ext)) return true;
+            }
+            return false;
+        });
+        return files == null ? List.of() : Arrays.asList(files);
+    }
+
     public static List<String> readFileLines(File file) throws IOException {
         List<String> lines = new ArrayList<>();
         BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8));