Integer to Turkish Text Representation

say_number.c

#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
 
const char* postnames[7] = {"Yüz", "Bin", "Milyon", "Milyar"};
const char* prenames[2][9] = {{"Bir", "İki", "Üç", "Dört", "Beş", "Altı", "Yedi", "Sekiz", "Dokuz"},
                            {"On", "Yirmi", "Otuz", "Kırk", "Elli", "Atmış", "Yetmiş", "Seksen", "Doksan"}};
 
typedef struct _NODE{
    const char* text;
    struct _NODE* next;
} NODE;
 
void add_reverse(NODE** head, const char* text){
    NODE* current = (NODE*) malloc(sizeof(NODE));
 
    current->text = text;
    current->next = *head;
    *head = current;
}
 
void remove_node(NODE** head){
    NODE* ret = (*head)->next;
 
    free(*head);
    *head = ret;
}
 
void print(NODE* head){
    while(head != 0){
        printf("%s ", head->text);
        head = head->next;
    }
    printf("\n");
}
 
void print_number(int number){
    int step = 0;
    NODE* head = 0;
    if(number < 0){ printf("Eksi "); number *= -1; }
 
    while(number > 0){
        int digit = number % 10;
 
        if(step % 3 == 0 && step > 0 && ((digit == 0 && (number / 10) % 100 > 0) || digit > 0))
            add_reverse(&head, postnames[0 + step / 3]);
 
        if(step % 3 == 2 && digit > 0)
            add_reverse(&head, postnames[step % 3 - 2]);
 
        if(digit > 0 && (step % 3 <= 1 || digit > 1))
            add_reverse(&head, prenames[step % 3 == 1 ? 1 : 0][digit - 1]);
 
        number /= 10;
        step += 1;
    }
    if(step == 4 && head->text == prenames[0][0]) remove_node(&head);
    print(head);
}
 
int main(){
    setlocale(LC_ALL, "Turkish");
    int sayi;
 
    while(1){
        scanf("%d", &sayi);
        print_number(sayi);
    }
    return 0;
}