Новогодишњи украси

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

#define MAX_SIZE (30 + 1)
#define UKRAS_LAMPICE "lampice"
#define UKRAS_LAMPIONI "lampioni"
#define UKRAS_JELKA "jelka"

typedef struct ukras_st{
    char prodavnica[MAX_SIZE];
    char ukras[MAX_SIZE];
    char vrsta[MAX_SIZE];
    double cena;
    struct ukras_st *sl;
}UKRAS;

void list_init(UKRAS**);
void delete_list(UKRAS**);
UKRAS* make_ukras(char*,char*,char*,double);
void add_to_list(UKRAS**,UKRAS*);
UKRAS* find(UKRAS*,char*);

FILE* safe_open(char*,char*);
void load(FILE*,UKRAS**);
void save(FILE*,UKRAS*);

int main(int argc,char** argv){
    if(argc != 3){
        printf("Nepravilan poziv programa.");
        return EXIT_FAILURE;
    }else{
        UKRAS* glava;
        FILE* file = safe_open(argv[1],"r");
        list_init(&glava);
        load(file,&glava);
        fclose(file);
        file = safe_open(argv[2],"w");
        save(file,glava);
        fclose(file);
        delete_list(&glava);
        return EXIT_SUCCESS;
    }
}

void list_init(UKRAS** glava){
    *glava = NULL;
    return;
}

void delete_list(UKRAS** glava){
    UKRAS* tmp;
    while(*glava != NULL){
        tmp = *glava;
        *glava = (*glava)->sl;
        free(tmp);
    }
    return;
}

UKRAS* make_ukras(char* prodavnica,char* ukras,char* vrsta,double cena){
    UKRAS* new = (UKRAS*)malloc(sizeof(UKRAS));
    if(new == NULL){
        printf("Nije moguce zauzeti memoriju.");
        exit(EXIT_FAILURE);
    }
    strcpy(new->prodavnica,prodavnica);
    strcpy(new->ukras,ukras);
    strcpy(new->vrsta,vrsta);
    new->cena = cena;
    new->sl   = NULL;
    return new;
}

void add_to_list(UKRAS** glava,UKRAS* new){
    if(*glava == NULL){
        *glava = new;
    }else{
        UKRAS* t = *glava;
        while(t->sl != NULL){
            t = t->sl;
        }
        t->sl = new;
    }
    return;
}

FILE* safe_open(char* name,char* mode){
    FILE* f = fopen(name,mode);
    if(f == NULL){
        printf("Nije moguce otviriti fajl %s.",name);
        exit(EXIT_FAILURE);
    }
    return f;
}

void load(FILE* f,UKRAS** glava){
    char prodavnica[MAX_SIZE],
         ukras[MAX_SIZE],
         vrsta[MAX_SIZE];
    double cena;
    while(fscanf(f,"%s %s %s %lf",
                                prodavnica,
                                ukras,
                                vrsta,
                                &cena) != EOF){
        add_to_list(glava,make_ukras(prodavnica,ukras,vrsta,cena));
    }
    return;
}

void save(FILE* f,UKRAS* glava){
    UKRAS* min;
    double sum = 0;
    if((min = find(glava,UKRAS_JELKA)) != NULL){
        fprintf(f,"%.2lf %s %s\n",min->cena,min->ukras,min->prodavnica);
        sum += min->cena;
    }
    if((min = find(glava,UKRAS_LAMPIONI)) != NULL){
        fprintf(f,"%.2lf %s %s\n",min->cena,min->ukras,min->prodavnica);
        sum += min->cena;
    }
    if((min = find(glava,UKRAS_LAMPICE)) != NULL){
        fprintf(f,"%.2lf %s %s\n",min->cena,min->ukras,min->prodavnica);
        sum += min->cena;
    }
    fprintf(f,"\nUkupna cena je: %.2lf",sum);
    return;
}

UKRAS* find(UKRAS* glava,char* param){
    UKRAS* min = NULL;
    while(glava != NULL){
        if(strcmp(glava->vrsta,param) == 0){
            if(min == NULL){
                min = glava;
            }else{
                if(min->cena > glava->cena){
                    min = glava;
                }
            }
        }
        glava = glava->sl;
    }
    return min;
}