fix: sudoku save

app/src/main/java/sudoku/Main.java

@@ -33,12 +33,20 @@ public class Main {
         SudokuSerializer.saveMultiDoku(md);
     }
 
+    public static void overwriteTest(int n){
+        MultiDoku md = SudokuFactory.createBasicXShapedMultidoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
+        new RandomSolver().solve(md);
+        SudokuPrinter.printMultiDoku(RenderableMultidoku.fromMultidoku(md), Symbols.Numbers, 3, 3);
+        SudokuSerializer.saveMultiDoku(md, n);
+    }
+
     public static void main(String[] args) {
         ConsoleInterface console = new ConsoleInterface();
         /*
         voidTest();
         filledTest();
-        filledTest();
+        overwriteTest(0);
+        overwriteTest(17)
         */
         console.welcome();
     }

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);
+    }
 }

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

@@ -124,17 +124,13 @@ public class SudokuSerializer {
 	 * @return String, the path of the save.
 	 */
 	public static String saveMultiDoku(final MultiDoku doku) {
-
 		JSONObject jsonRoot = serializeSudoku(doku);
-
 		File f = new File("save", "save.json");
 		int i = 0;
-
 		while (f.exists()) {
 			String newName = "save-" + ++i + ".json";
 			f = new File("save", newName);
 		}
-
 		try (FileWriter file = new FileWriter(f)) {
 			file.write(jsonRoot.toString(3));
 		} catch (IOException e) {
@@ -143,6 +139,27 @@ public class SudokuSerializer {
 		return f.getAbsolutePath();
 	}
 
+	public static String saveMultiDoku(final MultiDoku doku, final int saveToOverwrite) {
+		File f;
+		if (saveToOverwrite == 0) {
+			f = new File("save", "save.json");
+		}
+		else {
+			f = new File("save", "save-" + saveToOverwrite + ".json");
+		}
+		if (!f.exists()) {
+			return saveMultiDoku(doku);
+		}
+		else {
+			try (FileWriter file = new FileWriter(f)) {
+				file.write(serializeSudoku(doku).toString(3));
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+			return f.getAbsolutePath();
+		}
+	}
+
 	/**
 	 * Get a MultiDoku from a pre-existing json save file.
 	 *