diff --git a/src/main.rs b/src/main.rs
index 690742a..097c868 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -46,31 +46,147 @@ fn check_collisions(
 }
 
 /// Parse the config file, generate the world and robot pool.
-fn parse_config(conf: String, pool: &mut Vec<robot::Robot>) -> Result<world::World, &'static str> {
+fn parse_config(conf: String, pool: &mut Vec<robot::Robot>) -> Result<world::World, String> {
     let mut lines = conf.lines();
     // The first line of the config file should be the World.
     let raw_line: &str = match lines.next() {
         Some(raw) => raw,
-        None => return Err("Could not read the first line of the config file !"),
+        None => {
+            return Err(String::from(
+                "Could not read the first line of the config file !",
+            ))
+        }
     };
     let mut tokens = raw_line.split_whitespace();
     let token1 = match tokens.next() {
         Some(raw) => raw,
-        None => return Err("Could not read the first token of the first line !"),
+        None => {
+            return Err(String::from(
+                "Could not read the first token of the first line !",
+            ))
+        }
     };
     let token2 = match tokens.next() {
         Some(raw) => raw,
-        None => return Err("Could not read the second token of the first line !"),
+        None => {
+            return Err(String::from(
+                "Could not read the second token of the first line !",
+            ))
+        }
     };
     let x: i32 = match token1.parse::<i32>() {
         Ok(x) => x,
-        Err(_) => return Err("Could not convert token one from the first string to i32"),
+        Err(_) => {
+            return Err(String::from(
+                "Could not convert token one from the first string to i32",
+            ))
+        }
     };
     let y: i32 = match token2.parse::<i32>() {
         Ok(x) => x,
-        Err(_) => return Err("Could not convert token two from the first string to i32"),
+        Err(_) => {
+            return Err(String::from(
+                "Could not convert token two from the first string to i32",
+            ))
+        }
     };
-    Ok(world::World { x, y })
+    let w = world::World { x, y };
+    let mut r_id: u32 = 0;
+    loop {
+        r_id += 1;
+        // This line should be empty.
+        let empty_line = match lines.next() {
+            None => break,
+            Some(x) => x,
+        };
+        if !empty_line.is_empty() {
+            return Err(String::from("This line should be empty !"));
+        }
+        let raw_setup = match lines.next() {
+            None => return Err(String::from("This line should be the config !")),
+            Some(raw) => raw,
+        };
+        if raw_setup.is_empty() {
+            return Err(String::from("This line should not be empty !"));
+        }
+        let raw_inst = match lines.next() {
+            None => return Err(String::from("This line should be the instruction !")),
+            Some(raw) => raw,
+        };
+        if raw_inst.is_empty() {
+            return Err(String::from("This line should not be empty !"));
+        }
+        // Parse the setup line of the robot.
+        let mut setup = raw_setup.split_whitespace();
+        let pos_x = match setup.next() {
+            None => {
+                return Err(String::from(
+                    "Could not read the first token of the setup line !",
+                ))
+            }
+            Some(raw) => raw,
+        };
+        let pos_y = match setup.next() {
+            None => {
+                return Err(String::from(
+                    "Could not read the second token of the setup line !",
+                ))
+            }
+            Some(raw) => raw,
+        };
+        let orientation = match setup.next() {
+            None => {
+                return Err(String::from(
+                    "Could not read the third token of the setup line !",
+                ))
+            }
+            Some(raw) => raw,
+        };
+        // Convert values of the setup line
+        let r_x = match pos_x.parse::<i32>() {
+            Err(_) => {
+                return Err(String::from(
+                    "Could not convert the first token of the setup ligne to i32 !",
+                ))
+            }
+            Ok(raw) => raw,
+        };
+        let r_y = match pos_y.parse::<i32>() {
+            Err(_) => {
+                return Err(String::from(
+                    "Could not convert the second token of the setup ligne to i32 !",
+                ))
+            }
+            Ok(raw) => raw,
+        };
+        let r_o = match orientation {
+            "N" => robot::Orientation::N,
+            "E" => robot::Orientation::E,
+            "S" => robot::Orientation::S,
+            "W" => robot::Orientation::W,
+            _ => {
+                return Err(String::from(
+                    "The third token of the setup line do not match any orientations !",
+                ))
+            }
+        };
+
+        // Convert instructions line.
+        let inst: Vec<char> = raw_inst.chars().collect();
+        if !world::is_instructions(&inst) {
+            return Err(String::from("Invalid instructions !"));
+        }
+
+        let r = robot::Robot::new(r_id, r_o, robot::Position { x: r_x, y: r_y }, inst);
+
+        // Load robot inside the pool.
+        match check_map(&r, &w) {
+            Ok(()) => pool.push(r),
+            Err(err) => return Err(err),
+        }
+    }
+
+    Ok(w)
 }
 
 /// Retrieve the content of a file and return it as a string.
diff --git a/src/robot.rs b/src/robot.rs
index a06e218..7ab8c5a 100644
--- a/src/robot.rs
+++ b/src/robot.rs
@@ -56,6 +56,19 @@ pub struct Position {
     pub y: i32,
 }
 
+/// Check if instructions list is valid.
+pub fn is_instructions(v: &Vec<char>) -> bool {
+    for c in v {
+        match c {
+            'F' => continue,
+            'R' => continue,
+            'L' => continue,
+            _ => return false,
+        }
+    }
+    true
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -95,4 +108,17 @@ mod tests {
         assert_eq!(r.p.x, 0);
         assert_eq!(r.p.y, 3);
     }
+
+    #[test]
+    fn is_instructions_test() {
+        let v = vec!['F', 'R', 'L', 'F'];
+        assert!(is_instructions(&v));
+    }
+
+    #[test]
+    #[should_panic]
+    fn is_instructions_test_fail() {
+        let v = vec!['F', 'R', 'L', 'Z'];
+        assert!(is_instructions(&v));
+    }
 }