bool compare_lists(SinglyLinkedListNode* head1, SinglyLinkedListNode* head2) {

int c=0; 

while(head1!=NULL || head2!=NULL)
{
    if(head1==NULL || head2==NULL)
    {
        return 0;
    }
    if(head1->data == head2->data){

        c=c+1;
    }

    else {
        c=0;
        break;
    }
    head1=head1->next;
    head2=head2->next;
}
    if(c==0)
    {
        return 0;
    }
    else {
    return 1;
    }

}