#include "snake.h" #include struct snake* add_snake(struct snake* snake, int x, int y) { struct snake* head = calloc(1, sizeof(struct snake)); if (head == NULL) { return NULL; // Handle memory allocation failure } head->x = x; head->y = y; head->next = snake; return head; } struct snake* remove_snake(struct snake* snake) { if (snake == NULL) { return NULL; } if (snake->next == NULL) { free(snake); return NULL; } struct snake* this = snake; struct snake* prev = NULL; while (this->next != NULL) { prev = this; this = this->next; } free(this); prev->next = NULL; return snake; } void free_snake(struct snake* sn) { if (sn == NULL) { return; } free_snake(sn->next); free(sn); } int is_snake(struct snake* snake, int x, int y) { for (struct snake* this = snake; this != NULL; this = this->next) { if (this->x == x && this->y == y) { return 1; } } return 0; } int step_state(struct state* st) { int nx = (st->snake->x + st->sx); int ny = (st->snake->y + st->sy); return END_CONTINUE; }