int vypis(){
    FILE *fr;
    if ((fr = fopen("DNAsekvencia.dat", "r")) == NULL) {
        printf("Neotvoreny subor\n");
        return 0;
    }
    int p;
    scanf("%d", &p);
    if ((p >= 1) &&( p <= 20)){
        int count = 0, c, riad = 0;
        while (((c = getc(fr)) != EOF) && count < MAX){
            if (c == '\n' || c == ' ') continue;
            if(riad == p){
                putchar('\n');
                riad = 0;
            }
            putchar(c);
            riad++;
            count++;
        }
        putchar('\n');
    }
    else printf("Nespravny pocet nukleotidov na riadok\n");
    if (fclose(fr) == EOF){
        printf("Nezatvoreny subor\n");
    }
    return 0;
}