public void VisitIfStmt(IfStmt stmt)
 {
     Resolve(stmt.Condition);
     Resolve(stmt.ThenBranch);
     if (stmt.ElseBranch != null)
     {
         Resolve(stmt.ElseBranch);
     }
 }
 public void VisitIfStmt(IfStmt stmt)
 {
     if (IsTruthy(Evaluate(stmt.Condition)))
     {
         Execute(stmt.ThenBranch);
     }
     else if (stmt.ElseBranch != null)
     {
         Execute(stmt.ElseBranch);
     }
 }