fix: resolve error if input file don't has extension

jadx-core/src/main/java/jadx/core/dex/visitors/RenameVisitor.java

@@ -23,6 +23,7 @@ import jadx.core.dex.nodes.DexNode;
 import jadx.core.dex.nodes.FieldNode;
 import jadx.core.dex.nodes.MethodNode;
 import jadx.core.dex.nodes.RootNode;
+import jadx.core.utils.files.FileUtils;
 import jadx.core.utils.files.InputFile;
 
 public class RenameVisitor extends AbstractVisitor {
@@ -35,9 +36,7 @@ public class RenameVisitor extends AbstractVisitor {
 		}
 		InputFile firstInputFile = dexNodes.get(0).getDexFile().getInputFile();
 		Path inputFilePath = firstInputFile.getFile().getAbsoluteFile().toPath();
-
-		String inputName = inputFilePath.getFileName().toString();
-		String baseName = inputName.substring(0, inputName.lastIndexOf('.'));
+		String baseName = FileUtils.getPathBaseName(inputFilePath);
 		Path deobfMapPath = inputFilePath.getParent().resolve(baseName + ".jobf");
 
 		JadxArgs args = root.getArgs();

jadx-core/src/main/java/jadx/core/utils/files/FileUtils.java

@@ -232,6 +232,15 @@ public class FileUtils {
 		}
 	}
 
+	public static String getPathBaseName(Path file) {
+		String fileName = file.getFileName().toString();
+		int extEndIndex = fileName.lastIndexOf('.');
+		if (extEndIndex == -1) {
+			return fileName;
+		}
+		return fileName.substring(0, extEndIndex);
+	}
+
 	public static File toFile(String path) {
 		if (path == null) {
 			return null;