fix: clear buffer of line writer file

gradle.properties

@@ -1,4 +1,4 @@
 project_group = me.topchetoeu
 project_name = jscript
-project_version = 0.9.5-beta
+project_version = 0.9.6-beta
 main_class = me.topchetoeu.jscript.utils.JScriptRepl

src/java/me/topchetoeu/jscript/common/Buffer.java

@@ -24,6 +24,11 @@ public class Buffer {
         return n;
     }
 
+    public void clear() {
+        data = new byte[128];
+        length = 0;
+    }
+
     public void append(byte b) {
         write(length, new byte[] { b });
     }

src/java/me/topchetoeu/jscript/utils/filesystem/File.java

@@ -99,6 +99,7 @@ public interface File {
                         if (b == '\n') {
                             try {
                                 writer.writeLine(new String(buff.data()));
+                                buff.clear();
                             }
                             catch (IOException e) {
                                 throw new FilesystemException(ErrorReason.UNKNOWN, e.getMessage());