Program to merge link list

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

struct node1
{
struct node1 *link;
int info;
};
struct node1 *start1=NULL;

struct node2
{
struct node2 *link;
int info;
};
struct node2 *start2=NULL;

struct merge
{
struct merge *link;
int info;
};
struct merge *start=NULL;

void main()
{
int ch;
while(ch!=5)
{
clrscr();
printf(\"1 for insert in first linklist\\n\");
printf(\"2 for insert in second linklist\\n\");
printf(\"3 for display first & second linklist\\n\");
printf(\"4 for merge linklist\\n\");
printf(\"5 for exit\\n\");
printf(\"\\nEnter ur choice:\");
scanf(\"%d\",&ch);
switch(ch)
{
case 1: insert1();
    break;
case 2: insert2();
    break;
case 3: display();
    break;
case 4: merge_dis();
    break;
case 5: break;
}
}
}

merge_dis()
{
struct node1 *temp1;
struct node2 *temp2;
struct merge *temp,*temp10;
int t=0;
for(temp1=start1,temp2=start2;temp1!=NULL,temp2!=NULL;temp1=temp1->link,temp2=temp2->link)
       {
       if(temp1->info>=temp2->info)
           {
          if(temp1->info=temp2->info)
          {
          temp1++;
          }
          t=temp2->info;
          temp->info=t;
          temp->link=start;
          start= temp;
          temp2++;
           }
       else
           {
          t=temp1->info;
          temp->info=t;
          temp->link=start;
          start=temp;
          temp1++;
           }

}

printf(\"\\nThe Information of Merge linklist\\n\");

for(temp10=start;temp10!=NULL;temp10=temp10->link)
{
printf(\"%d \",temp10->info);
}
getch();
}

insert1()
{
struct node1 *new;
new=(struct node1 *)malloc(sizeof(struct node1));
printf(\"Enter the info\");
scanf(\"%d\",&new->info);
new->link=start1;
start1=new;
}

insert2()
{
struct node2 *new;
new=(struct node2 *)malloc(sizeof(struct node2));
printf(\"Enter the info\");
scanf(\"%d\",&new->info);
new->link=start2;
start2=new;
}

display()
{
struct node1 *temp;
struct node2 *temp1;
printf(\"\\nThe Information of First linklist\\n\");
for(temp=start1;temp!=NULL;temp=temp->link)
{
printf(\"%d \",temp->info);
}
printf(\"\\nThe Information of Second linklist\\n\");
for(temp1=start2;temp1!=NULL;temp1=temp1->link)
{
printf(\"%d \",temp1->info);
}
getch();
}