diff --git a/src/main.rs b/src/main.rs
index 097c868..3975876 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -173,7 +173,7 @@ fn parse_config(conf: String, pool: &mut Vec<robot::Robot>) -> Result<world::Wor
 
         // Convert instructions line.
         let inst: Vec<char> = raw_inst.chars().collect();
-        if !world::is_instructions(&inst) {
+        if !robot::is_instructions(&inst) {
             return Err(String::from("Invalid instructions !"));
         }
 
@@ -228,7 +228,7 @@ mod tests {
 
     #[test]
     fn test_check_map() {
-        let mut r = robot::Robot::new(
+        let r = robot::Robot::new(
             0,
             robot::Orientation::N,
             robot::Position { x: 2, y: 3 },
@@ -242,7 +242,7 @@ mod tests {
     #[test]
     #[should_panic]
     fn test_check_map_fail() {
-        let mut r = robot::Robot::new(
+        let r = robot::Robot::new(
             0,
             robot::Orientation::N,
             robot::Position { x: 2, y: 4 },
@@ -256,7 +256,7 @@ mod tests {
     #[test]
     #[should_panic]
     fn test_check_collisions() {
-        let mut r = robot::Robot::new(
+        let r = robot::Robot::new(
             0,
             robot::Orientation::N,
             robot::Position { x: 2, y: 3 },