void decl_delete( struct decl *d )
{
if (!d) return;
free( d-> name );
type_delete( d->type );
expr_delete( d->value );
stmt_delete( d->code );
decl_delete( d->next );
free( d );
}
//deletes a statement and all of its pointers
void stmt_delete(struct stmt *s){
if(!s) return;
decl_delete(s->decl);
expr_delete(s->init_expr);
expr_delete(s->expr);
expr_delete(s->next_expr);
stmt_delete(s->body);
stmt_delete(s->else_body);
free(s);
}
