C语言拆分单链表

#include <stdio.h>
#include <stdlib.h>

struct node {
   int data;
   struct node *next;
};

struct node *even = NULL;
struct node *odd = NULL;
struct node *list = NULL;

//Create Linked List
void insert(int data) {
   // Allocate memory for new node;
   struct node *link = (struct node*) malloc(sizeof(struct node));
   struct node *current;

   link->data = data;
   link->next = NULL;

   if(list == NULL) {
      list = link;
      return;
   }
   current = list;

   while(current->next!=NULL)
      current = current->next;

   // Insert link at the end of the list
   current->next = link; 
}

void display(struct node *head) {
   struct node *ptr = head;

   printf([head] =>);
   //start from the beginning
   while(ptr != NULL) {        
      printf( %d =>,ptr->data);
      ptr = ptr->next;
   }

   printf( [null]\n);
}

void split_list() {
   // Allocate memory for new node;
   struct node *link;
   struct node *current;

   while(list != NULL) {
      struct node *link = (struct node*) malloc(sizeof(struct node));

      link->data = list->data;
      link->next = NULL;

      if(list->data%2 == 0) {
         if(even == NULL) {
            even = link;
            list = list->next;
            continue;
         } else {
            current = even;

            while(current->next != NULL)
            current = current->next;

            // Insert link at the end of the list
            current->next = link; 
         }
         list = list->next;

      } else {
         if(odd == NULL) {
            odd = link;
            list = list->next;
            continue;
         } else {
            current = odd;
            while(current->next!=NULL)
            current = current->next;

            // Insert link at the end of the list
            current->next = link; 

         }
         list = list->next;
      }
   }
}

int main() {
   int i;

   for(i = 1; i <= 10; i++)
      insert(i);

   printf(Complete list: \n);
   display(list);

   split_list();

   printf(\nOdd  : );
   display(odd);

   printf(Even : );
   display(even);

   return 0;
}