given the structs, make a program that frees the memory associated with a user's friends
typedef struct user {
    char name[32];
    char profile_pic[32];  // This is a *filename*, not the file contents.
    struct post *first_post;
    struct user *friends[10];
    struct user *next;
} User;

typedef struct post {
    char author[32];
    char *contents;
    time_t *date;
    struct post *next;
} Post;