mostly fixed sanitization issue

repl/lib_fileio.c

@@ -486,6 +486,7 @@ static int nativeSeek(Toy_Interpreter* interpreter, Toy_LiteralArray* arguments)
 	Toy_pushLiteralArray(&interpreter->stack, resultLiteral);
 
 	// cleanup
+	Toy_deleteRefString(orginString);
 	Toy_freeLiteral(resultLiteral);
 	Toy_freeLiteral(offsetLiteral);
 	Toy_freeLiteral(selfLiteral);

test/scripts/lib/fileio.toy

@@ -42,7 +42,6 @@ fn reset() {
     writer.close();
 }
 
-
 // test open and close
 {
     var reader = open(PATH, "r");
@@ -145,4 +144,8 @@ fn reset() {
     reader.close();
 }
 
+// standard in/out are closed to prevent memory leaks
+input.close();
+output.close();
+
 print "All good";