stack program

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

void clrscr() { system("@cls||clear");}

struct Node{
	int stock;
	char genre[8];
	struct Node *next;
};

void printList(struct Node *n) {
	if(n!=NULL&&n->stock>0){
		printf("[ %-14s | %-3d song(s) ] --> [top]\n",n->genre,n->stock);
		n=n->next;
	}
	while(n != NULL){
		if(n->stock==0){
			n=n->next;
		}else{
			printf("[ %-14s | %-3d song(s) ]\n",n->genre,n->stock);
			n=n->next;
		}
	}
}
int main(){
	struct Node* head= NULL;
	head=(struct Node*)malloc(sizeof(struct Node));
	head->next=NULL;
	head->stock=0;
	int ulang=1;
	int counter=0;
	do{
		clrscr();
		printf("JACKIE CD STOCK\n");
		printf("_______________\n\n");
		printf(" CD Stock <STACK>\n");
		printList(head);
		printf("\n\nOption :\n");
		printf("1. Stock of CD\n");
		printf("2. Sell a CD\n");
		printf("3. Exit\n");
		int choice;
		do{
			printf("\n>>> Input choice : ");
			scanf("%d",&choice);
			if(choice<1||choice>3){
				printf("\t\t\t[!] Menu Unavaiable!");
			}
		}while(choice<1||choice>3);
		clrscr();
		switch(choice){
			case 1:{
				if(counter==0){
					char cdgenre[8];
					int rep=0;
					do{
						printf("Input CD Genre [rock/jazz/blues] : ");
						scanf("%s",cdgenre);
						if(strcmp("rock",cdgenre)==0||strcmp("jazz",cdgenre)==0||strcmp("blues",cdgenre)==0){
							rep=1;
						}
					}while(rep==0);
					int song_number;
					rep=0;
					do{
						printf("\nInput the number of songs on the CD [5...12 song<s>] : ");
						scanf("%d",&song_number);
						if(song_number>4&&song_number<13){
							rep=1;
						}
					}while(rep==0);
					if(strcmp("rock",cdgenre)==0){
						strcpy(head->genre,"rock CD");
					}
					if(strcmp("jazz",cdgenre)==0){
						strcpy(head->genre,"jazz CD");
					}
					if(strcmp("blues",cdgenre)==0){
						strcpy(head->genre,"blues CD");
					}
					head->stock=song_number;
					counter++;
					printf("\n--- Add CD Success ---");
					getch();
				}else{
					if(counter>0&&counter<10){
						struct Node* top= NULL;
						top=(struct Node*)malloc(sizeof(struct Node));
						top->next=head;
						head=top;
						char cdgenre[8];
						int rep=0;
						do{
							printf("Input CD Genre [rock/jazz/blues] : ");
							scanf("%s",cdgenre);
							if(strcmp("rock",cdgenre)==0||strcmp("jazz",cdgenre)==0||strcmp("blues",cdgenre)==0){
								rep=1;
							}
						}while(rep==0);
						int song_number;
						rep=0;
						do{
							printf("\nInput the number of songs on the CD [5...12 song<s>] : ");
							scanf("%d",&song_number);
							if(song_number>4&&song_number<13){
								rep=1;
							}
						}while(rep==0);
						if(strcmp("rock",cdgenre)==0){
							strcpy(head->genre,"rock CD");
						}
						if(strcmp("jazz",cdgenre)==0){
							strcpy(head->genre,"jazz CD");
						}
						if(strcmp("blues",cdgenre)==0){
							strcpy(head->genre,"blues CD");
						}
						head->stock=song_number;
						counter++;
						printf("\n--- Add CD Success ---");
						getch();
					}else{
						printf("Stack Overflow!!");
						getch();
					}
				}
				break;
			}
			case 2:{
				if(counter==0){
					printf("--- The CD Storage is Empty ---");
					getch();
				}else{
					head=head->next;
					printf("--- Sell CD Success ---");
					counter--;
					getch();
				}
				break;
			}
			case 3:{
				ulang=0;
				break;
			}
		}
	}while(ulang==1);
	return 0;
}