remove instruction related code

src/main.rs

@@ -135,13 +135,6 @@ enum Orientation {
     W,
 }
 
-/// Enum to store all possible instructions.
-enum Instruction {
-    L,
-    R,
-    F,
-}
-
 /// Parse char and return corresponding orientation.
 fn parse_orientation(c: char) -> Result<Orientation, &'static str> {
     match c {
@@ -153,15 +146,6 @@ fn parse_orientation(c: char) -> Result<Orientation, &'static str> {
     }
 }
 
-/// Parse char and return corresponding instruction.
-fn parse_instruction(c: char) -> Result<Instruction, &'static str> {
-    match c {
-        'L' => Ok(Instruction::L),
-        'R' => Ok(Instruction::R),
-        'F' => Ok(Instruction::F),
-        _ => Err("Invalid character, does not match any instructions"),
-    }
-}
 
 /// Retrieve the content of a file and return it as a string.
 fn open_file(filename: &str) -> io::Result<String> {
@@ -204,14 +188,6 @@ mod tests {
         assert!(parse_orientation('Z').is_err());
     }
 
-    #[test]
-    fn test_parse_instruction() {
-        assert!(parse_instruction('L').is_ok());
-        assert!(parse_instruction('R').is_ok());
-        assert!(parse_instruction('F').is_ok());
-        assert!(parse_instruction('Z').is_err());
-    }
-
     #[test]
     fn test_open_file() {
         assert!(open_file("two_robots.txt").is_ok());
@@ -289,10 +265,6 @@ mod tests {
         w.create();
         r.move_forward(&mut w);
         assert_eq!(0, r.p.y);
-        r.move_right(&mut w);
-        assert_eq!(2, r.p.x);
-        r.move_left(&mut w);
-        assert_eq!(1, r.p.x);
     }
 
     #[test]