feat: better shared contraints and backtrace working !

app/src/main/java/sudoku/Sudoku.java

@@ -11,12 +11,21 @@ import sudoku.core.Console;
 public class Sudoku {
     private final Grille grille;
     private final List<Contrainte> contraintes;
+    private String nom;
 
     public Sudoku(int taille) {
         this.grille = new Grille(taille, this);
         this.contraintes = new ArrayList<>();
     }
 
+    public void setNom(String nom) {
+        this.nom = nom;
+    }
+
+    public String getNom() {
+        return this.nom;
+    }
+
     public void ajouterContrainte(Contrainte contrainte) {
         contraintes.add(contrainte);
     }
@@ -34,6 +43,18 @@ public class Sudoku {
         return true;
     }
 
+    public boolean estValide() {
+        for (int i = 0; i < this.getGrille().getTaille(); i++) {
+            for (int j = 0; j < this.getGrille().getTaille(); j++) {
+                Case c = this.getGrille().getCase(i, j);
+                if (c.getSymbole() != null && !this.estValide(c)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
     public boolean verifierToutesContraintes() {
         return grille.verifierToutesContraintes(contraintes);
     }