Revert "Change (c : char) in"

This reverts commit edf29050c6.

Bad optimization...

src/main.rs

@@ -11,7 +11,7 @@ enum Instruction {
     F,
 }
 
-fn parse_orientation(c: &char) -> Result<Orientation, &'static str> {
+fn parse_orientation(c: char) -> Result<Orientation, &'static str> {
     match c {
         'N' => Ok(Orientation::N),
         'E' => Ok(Orientation::E),
@@ -21,7 +21,7 @@ fn parse_orientation(c: &char) -> Result<Orientation, &'static str> {
     }
 }
 
-fn parse_instruction(c: &char) -> Result<Instruction, &'static str> {
+fn parse_instruction(c: char) -> Result<Instruction, &'static str> {
     match c {
         'L' => Ok(Instruction::L),
         'R' => Ok(Instruction::R),