switched return type of is_game_over from bool to GameEnd

engine/src/lib.rs

@@ -6,13 +6,14 @@ pub mod movetype;
 pub mod gameend;
 
 use chessmove::ChessMove;
+use gameend::GameEnd;
 
 pub fn get_available_moves(fen: &str) -> Vec<ChessMove> {
   println!("get_available_moves answered");
   return vec![];
 }
 
-pub fn is_game_over(fen: &str) -> bool {
+pub fn is_game_over(fen: &str) -> Option<GameEnd> {
   println!("is_game_over answered");
-  return false;
+  return None;
 }