diff --git a/include/utils/assets.h b/include/utils/assets.h
index d91b126..7f7eb1d 100644
--- a/include/utils/assets.h
+++ b/include/utils/assets.h
@@ -12,11 +12,8 @@ void assets_load(assets *info);
 
 void assets_extract();
 
-// RUST DEMO START
+void assets_log_init(uint8_t verbose);
 
-void rust_test_single(const char *ptr);
-void rust_test_multi(char *const *ptr);
-
-// RUST DEMO END
+uint8_t rust_assets_update(const char *file, char *const *sources, const char *assets_dir);
 
 #endif
diff --git a/src/assets/src/ffi.rs b/src/assets/src/ffi.rs
index 30817ce..4dfa13b 100644
--- a/src/assets/src/ffi.rs
+++ b/src/assets/src/ffi.rs
@@ -1,3 +1,5 @@
+use log::debug;
+use std::env::set_var;
 use std::os::raw::c_char;
 use std::ffi::{CStr, CString};
 
@@ -20,22 +22,26 @@ unsafe fn load_c_string_list(ptr: *const *const c_char) -> Vec<String> {
 }
 
 #[no_mangle]
-pub unsafe extern "C" fn rust_test_single(ptr: *const c_char) {
-    println!("enter rust function");
-
-    let ret = load_c_string(ptr);
-    println!("ret: {:?}", ret);
-
-    println!("exit rust function");
+pub unsafe extern "C" fn assets_log_init(verbose: u8) {
+    if verbose == 0 { // bool value `FALSE`
+        set_var("RUST_LOG", "info");
+    } else {
+        set_var("RUST_LOG", "trace");
+    }
+    env_logger::init();
 }
 
-
 #[no_mangle]
-pub unsafe extern "C" fn rust_test_multi(ptr: *const *const c_char) {
-    println!("enter rust function");
+pub unsafe extern "C" fn rust_assets_update(
+    file: *const c_char, sources: *const *const c_char, assets_dir: *const c_char) -> u8 {
+
+    let file = load_c_string(file); // import c-style string
+    let sources = load_c_string_list(sources);
+    let assets_dir = load_c_string(assets_dir);
 
-    let ret = load_c_string_list(ptr);
-    println!("ret: {:?}", ret);
+    debug!("file: {}", file);
+    debug!("source: {:?}", sources);
+    debug!("assets dir: {}", assets_dir);
 
-    println!("exit rust function");
+    0
 }
diff --git a/src/assets/src/lib.rs b/src/assets/src/lib.rs
index 9097f4b..7b003b3 100644
--- a/src/assets/src/lib.rs
+++ b/src/assets/src/lib.rs
@@ -1,9 +1,3 @@
-// mod fetch;
-//
-// use std::env::set_var;
-//
-// use crate::fetch::Asset;
-
 mod ffi;
 
 // use std::ffi::{c_char, CStr};
diff --git a/src/cleardns.c b/src/cleardns.c
index 2e9fb62..a58d73d 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -130,22 +130,10 @@ int main(int argc, char *argv[]) {
     char *tmp = string_list_dump(demo);
     log_warn("dump -> %s", tmp);
 
-    log_info("string list -> %p -> %p", &demo, demo);
-    log_info("string list 1 -> %p -> %p -> `%s`", &demo[0], demo[0], demo[0]);
-    log_info("string list 2 -> %p -> %p -> `%s`", &demo[1], demo[1], demo[1]);
-    log_info("string list 3 -> %p -> %p -> `%s`", &demo[2], demo[2], demo[2]);
-    log_info("string list 4 -> %p -> %p -> `%s`", &demo[3], demo[3], demo[3]);
-    log_info("string list 5 -> %p -> %p -> `%s`", &demo[4], demo[4], demo[4]);
-    log_info("string list 6 -> %p -> %p -> `%s`", &demo[5], demo[5], demo[5]);
-
-    rust_test_multi(demo);
-
-    log_info("string list 1 -> %p -> %p -> `%s`", &demo[0], demo[0], demo[0]);
-    log_info("string list 2 -> %p -> %p -> `%s`", &demo[1], demo[1], demo[1]);
-    log_info("string list 3 -> %p -> %p -> `%s`", &demo[2], demo[2], demo[2]);
-    log_info("string list 4 -> %p -> %p -> `%s`", &demo[3], demo[3], demo[3]);
-    log_info("string list 5 -> %p -> %p -> `%s`", &demo[4], demo[4], demo[4]);
-    log_info("string list 6 -> %p -> %p -> `%s`", &demo[5], demo[5], demo[5]);
+//    assets_log_init(TRUE);
+    assets_log_init(FALSE);
+
+    rust_assets_update("test.txt", demo, ASSETS_DIR);
 
     string_list_free(demo);