fix: sudoku save

app/src/main/java/sudoku/io/ConsoleInterface.java

@@ -69,6 +69,8 @@ public class ConsoleInterface {
         }
         System.out.println("Here's your sudoku !");
         showMultidoku(doku, listSymbols, width, height);
+        System.out.println("You can now save it!");
+        saveMultiDoku(doku);
     }
 
     private MultiDoku saveChoice() {
@@ -175,4 +177,10 @@ public class ConsoleInterface {
         SudokuPrinter.printMultiDoku(doku, listSymbols, width, height);
     }
 
+    private void saveMultiDoku(MultiDoku doku){
+        System.out.println("Number of the file to overwrite ('-1' or unused save file number to create a new save) :");
+        int n = reader.nextInt();
+        String path = SudokuSerializer.saveMultiDoku(doku, n);
+        System.out.println("The path to your save is:" + path);
+    }
 }