C - Default Function

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

typedef struct{
    char *name;
    char *city;
    int age;
}data;

int addName(data *d){
    d->name = "lady gaga";

    return 0;
}

int addCity(data *d){
    d->city = "new york";

    return 0;
}

int addAge(data *d){
    d->age = 24;

    return 0;
}

int set_default(data *d){

    addName(d);
    addCity(d);
    addAge(d);

    return 0;
}

char* getName(data *d){
    return d->name;
}

char* getCity(data* d){
    return d->city;
}

int getAge(data* d){
    return d->age;
}

int changeName(data* d, const char* name){
    d->name = (char *)malloc(1*sizeof(char));
    strcpy(d->name, name);

    return 0;
}

int changeCity(data* d, const char* city){
    d->city = (char *) malloc(1*sizeof(char));
    strcpy(d->city, city);

    return 0;
}

int changeAge(data* d, int age){
    d->age = age;

    return 0;
}

int main(int c){
    system("color 5f");

    data* list;
    list = (data*) malloc(10*sizeof(data));

    set_default(list);



    printf("%s, %d of %s",getName(list), getAge(list), getCity(list));

    return 0;
}

C - Default Function