if(head==NULL){
        return NULL;
    }
    if(head->next != NULL && head->next->next==NULL){
        struct node* first = malloc(sizeof(struct node));
        memcpy(head,first, sizeof(struct node));
        first->next=NULL;
        return first;
    }
    struct node* current = head->next;
    int index = 1;

    struct node* tempPointer = (struct node*) malloc(sizeof(struct node));
    struct node* tempax = tempPointer;
    if(tempPointer==NULL){
        free(tempPointer);
        return NULL;
    }
    memcpy(tempPointer,head, sizeof(struct node));

    while(current != NULL){
        if(index%2 ==0){
            tempPointer->next=malloc(sizeof(struct node));
            memcpy(tempPointer->next, current, sizeof(struct node));
            tempPointer=tempPointer->next;
        }
        current = current->next;
        index ++;
    }
    return tempax;