DSA music player

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
struct song{
 char b[20];
 struct song* prev;
 struct song* next;
};
struct song* head;
void insert(struct song** headptr){
	struct song* newsong= (struct song*)malloc(sizeof(struct song));
	struct song* ptr;
	printf("Enter a new song: ");
	scanf("%s",&newsong->b);
	newsong->prev=NULL;
	newsong->next=NULL;
	if(*headptr==NULL){
	   *headptr=newsong;
	   newsong->next=*headptr;
	   newsong->prev=*headptr;
	}else{
	       ptr=*headptr;
	       while(ptr->next!=*headptr){
			ptr=ptr->next;
	       }
	       ptr->next=newsong;
	       newsong->next=*headptr;
	       newsong->prev=ptr;
	       (*headptr)->prev=newsong;
	}
}
void deletion(struct song** ptr){
struct song* temp;
	if((*ptr)->next==head && (*ptr)->prev==head){
	head=NULL;
	printf("Song Deleted. Playlist is empty.\n");
	}
	else if(*ptr==head){
	temp=(*ptr);
	head=head->next;
	head->prev=temp->prev;
	temp->prev->next=head;
	printf("Song Deleted.\n");
	}else if((*ptr)->next==head){
		temp=(*ptr)->prev;
		temp->next=head;
		head->prev=temp;
	}
}
void display(struct song* head){
struct song *ptr=head;
	do{
	printf("%s\n",ptr->b);
	ptr=ptr->next;
	}while(ptr!=head);
}

int main(){
int choice;
struct song* ptr;
	 do{

	      printf(" 1.Enter a New song\n 2.Display playlist\n 3. Play a song\n 4. Play next\n 5. Play previous\n 6.Exit\n 7.Delete this song");
	      printf("\nEnter your choice:- ");
	      scanf("%d",&choice);
	      switch(choice){
		  case 1: insert(&head); break;
		  case 2: display(head); break;
		  case 3: ptr=head;
			  printf("Playing %s\n",ptr->b); break;
		  case 4: ptr=ptr->next;
			  printf("Playing %s\n", ptr->b);break;
		  case 5: ptr=ptr->prev;
			printf("Playing %s\n", ptr->b); break;
		  case 6: break;
		  case 7: deletion(&ptr); break;
		  default: printf("Wrong Input.\n");
	      }

	 }while(choice!=6);
	 getch();
return 0;
}