#include "linked_list.h"
#include <stdio.h>
struct list* create_list(int value){
  struct list* item = malloc(1,sizeof(struct list));
  item->value = value;
  item->next = NULL;
  return item;
}
void destroy_list(struct list* list){
  if(list!=NULL){
    destroy_list(list->next);
    free(list);
  }
}
struct list* pop_list(struct list* list,int* value){
  struct list* item = list;
  if(list == NULL){
    return NULL;
  }
  while (item->next != NULL){
    item = item->next;
  }
  value = item->value;
  free(item);
  return list;
}
struct list* push_list(struct list* list,int value){
  struct list* new_item = malloc(1,sizeof(struct list));
  new_item->next = NULL;
  new_item->value = value;
  if (list == NULL){
    return new_item;
   }
  struct list* cursor = list;
  while(cursor->next != NULL){
    cursor = cursor->next;
  }
  cursor->next = item;
  return list;
}

struct list* shift_list(struct list* list,int value) {
  struct list* item = malloc(1,sizeof(struct list));
  item->value = value;
  if(list == NULL){
    item->next = NULL;
    return item;
  }
  item->next = list;
  return list;
  }
  struct list* unshift_list(struct list* list,int* value){
  if(list == NULL){
     return NULL;
  }
  struct list* item = list;
  value = item->value;
  list = item->next;
  free(item);
  return list;
}