#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#define SIZE 100

struct tree {
    char* value;
    struct tree* left;
    struct tree* right;
};

struct tree* read_tree(int counter){  
    char buffer[SIZE];  
    memset(buffer, 0, SIZE);  
    char* r = fgets(buffer, SIZE, stdin);  
    if(buffer[0] == '\n'){
        return NULL;    
    }
    assert(r); 
    struct tree* tree = calloc(1, sizeof(struct tree)); 
    tree->value = malloc(strlen(buffer) + 1);
    strcpy(tree->value,r);
    assert(tree->value); 
    if (buffer[0] == '*') {
        counter++;
        return tree;
    }
    tree->left = read_tree(counter);
    tree->right = read_tree(counter);
    return tree;  
} 

void destroy_tree(struct tree* tree) {
    if (tree == NULL) return;
    destroy_tree(tree->left);
    destroy_tree(tree->right);
    free(tree->value);
    free(tree);
}

void print_tree(struct tree* tree,int offset){
     char buffer[SIZE];  
    memset(buffer, 0, SIZE);  
    for (int i = 0; i < offset && tree->value[0] != '*'; i++){
        printf(" ");
    }
    printf("%s",tree->value);
    if(tree->value[0] == '*'){
        printf("Koniec\n");
        exit(0);
    }
    char r = getchar();
    if (r == 'a') {
        print_tree(tree->left, offset + 3);
    } else if (r == 'n') {
        print_tree(tree->right, offset + 3);
    } else {
        printf("CHYBOVY VSTUP!\n");
        exit(0);
    }
}

int main(){
    int counter = 0;
    int offset = 0;
    struct tree* root = read_tree(counter);
    printf("Expert z bufetu to vie.\n");
    printf("Pozna %d druhov ovocia a zeleniny.\n",counter);
    printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");
    print_tree(root,offset);
    destroy_tree(root);
    return 0;
}