fix path

src/device_var.rs

@@ -9,11 +9,12 @@ pub fn read_env_var() {
     let mut path = env::var("PWD").unwrap().to_string();
     path.push('/');
     path.push_str(filename);
+    println!("{}", path);
 
-    fs::read_to_string(path)
+    fs::read_to_string(path.clone())
         .expect("Something went wrong reading the file : device.env");
 
-    if let Ok(lines) = read_lines(filename) {
+    if let Ok(lines) = read_lines(path) {
         for line in lines {
             if let Ok(var) = line {
                 let new_var: Vec<&str> = var.split('=').collect();