Как вам такая демонстрация идеи программиования объектов на Си в стиле Go?

Тут поддерживается скрытие приватных полей и композиция методов.

goc.h

#ifndef GOC_H
#define GOC_H
#define fn(obj, fn, ...) (obj).fn(&(obj), ##__VA_ARGS__)
#endif

woman.h

#ifndef WOMAN_H
#define WOMAN_H
#include "goc.h"
struct woman;
typedef struct w {
    struct woman *w;
    void (* hug)(struct w *self);
    void (* kiss)(struct w *self);
} woman;
woman new_woman(char *);
void free_woman(woman *);
#endif

woman.c

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "woman.h"
struct woman {
    char *name;
    bool hugged;
    bool kissed;
};
void hug(woman *self) {
    if (self->w == NULL) {
        printf("No woman allocated!\n");
        return;
    }
    printf("You're hugging %s\n", self->w->name);
    if (self->w->hugged) {
        printf("%s say: It hurts, get off me!\n", self->w->name);
        return;
    }
    if (self->w->kissed) {
        printf("%s say: Get off me, butch!\n", self->w->name);
        return;
    }
    self->w->hugged = true;
    printf("%s say: you're sweet!\n", self->w->name);
}
void kiss(woman *self) {
    if (self->w == NULL) {
        printf("No woman allocated!\n");
        return;
    }
    printf("You're kissing %s\n", self->w->name);
    if (!self->w->hugged) {
        if (self->w->kissed) {
            printf("%s is calling the police!\n", self->w->name);
            return;
        }
        self->w->kissed = true;
        printf("%s say: How dare you?\n", self->w->name);
        return;
    }
    if (self->w->kissed) {
        printf("%s say: Level up, boy!\n", self->w->name);
        return;
    }
    self->w->kissed = true;
    printf("%s say: Mwah!\n", self->w->name);
}
woman new_woman(char *name) {
    struct woman *w = calloc(1, sizeof(struct woman));
    w->name = name;
    woman women = {
        .w = w,
        .hug = hug,
        .kiss = kiss
    };
    return women;
}
void free_woman(woman *w) {
    free(w->w);
    w->w = NULL;
}

main.c

#include <stdio.h>
#include "woman.h"
int main(void)
{
    woman woman;
    printf("\033[1mThe right workflow:\033[0m\n");
    woman = new_woman("Alice");
    fn(woman, hug);
    fn(woman, kiss);
    fn(woman, kiss);
    free_woman(&woman);
    putchar('\n');
    printf("\033[1mThe wrong workflow:\033[0m\n");
    woman = new_woman("Miranda");
    fn(woman, kiss);
    fn(woman, hug);
    fn(woman, kiss);
    free_woman(&woman);
    putchar('\n');
    printf("\033[1mThe dreaming workflow:\033[0m\n");
    fn(woman, hug);
    fn(woman, kiss);
    fn(woman, kiss);
    return 0;
}

Программа печатает:

The right workflow:
You're hugging Alice
Alice say: you're sweet!
You're kissing Alice
Alice say: Mwah!
You're kissing Alice
Alice say: Level up, boy!
The wrong workflow:
You're kissing Miranda
Miranda say: How dare you?
You're hugging Miranda
Miranda say: Get off me, butch!
You're kissing Miranda
Miranda is calling the police!
The dreaming workflow:
No woman allocated!
No woman allocated!
No woman allocated!