merge two linklist
 #include<stdio.h>  struct node  {    int data;    struct node *next;  };  struct node *start1=NULL;  struct node *start2=NULL;  struct node *start3=NULL;  struct node * create_list(struct node *start)  {int n;    struct node *ptr;    printf("\n enter how many element you want to insert");    scanf("%d",&n);    while(n!=0)    {      n--;      printf("\n enter data");      ptr=(struct node*)malloc(sizeof(struct node));      scanf("\n%d",&ptr->data);      if(start==NULL)      {          start=ptr;          ptr->next=NULL;      }      else      {          ptr->next=start;          start=ptr;      }    }    return start;  }  void display(struct node *temp1)  {      struct node *temp;      temp=temp1;      if(temp==NUL...