Merge pull request 'buffer : simpliciation de try_spawn' (#6) from feature/exit_codes into main

Reviewed-on: https://gitea.ahur.ac/ahurac/rash/pulls/6

src/buffer.rs

@@ -41,15 +41,13 @@ impl Buffer {
 
                 if result.code().is_some() {
                     return Some(result.code().unwrap());
-                } else {
-                    None
                 }
             } else {
                 eprintln!("{}", result.unwrap_err());
                 return Some(127);
             }
-        } else {
+        }
-            return None;
+
-        }
+        None
     }
 }