Where I am going wrong for deleting the duplicate in linked ist?

#include<stdio.h>
#include<stdlib.h>
typedef struct nodetype 
{
	int info ;
	struct nodetype *next ;
}node;
void rem(node*);
int main()
{
	int a=1,item;
	node *head=NULL,*ptr,*lol=NULL;
	printf("enter the integers");
	while(a<=5)
	{   
	head=(node*)malloc(sizeof(node));
    scanf("%d",&head->info);
    if(lol != NULL)
    {
    	ptr->next=head;
    	ptr = head;
	}
    else
	{
	 lol=ptr=head;
	}	
    	   	
    a++;
	}
	ptr->next=NULL;
	ptr=lol;
	rem(ptr);
	return 0;	
}
void rem(node *head)
{
	int i;
	node *brown,*ptr,*blue,*red,*pink,*yellow;
	brown=yellow=ptr=pink=blue=red=head;
	while(head!=NULL)
	{
		i=head->info;
		head=head->next;
		red=head;
		while(red!=NULL)
		{
			brown=red;
			while(red->info!=i)
			{
				pink=red;
				red=red->next;
			}
			if(red->info==i)
			{	
				yellow=red;
				pink->next=red->next;
				free(yellow);
			}
			red=brown;
			red=red->next;
		}
		
	}
		while(ptr!=NULL)
	{
		printf("%d\n",ptr->info);
		ptr=ptr->next;
	}
}