void	*ft_memset(void *buf, int ch, size_t count);

void	*ft_memcpy(void *dest, const void *source, size_t count);

void	*ft_memccpy(void *dest, const void *source, int ch, size_t count);

void	*ft_memmove(void *dest, const void *source, size_t count);

void	*ft_memchr(const void *arr, int c, size_t n);

void	*ft_calloc(size_t num, size_t size);

void	ft_bzero(void *s, size_t n);

void	ft_putchar_fd(char c, int fd);

void	ft_putstr_fd(char *s, int fd);

void	ft_putendl_fd(char *s, int fd);

void	ft_putnbr_fd(int n, int fd);

size_t	ft_strlcat(char *dst, const char *src, size_t size);

size_t	ft_strlcpy(char *dst, const char *src, size_t size);

int		ft_strichr(char *str, int sumb);

char	*ft_strchr(char *str, int sumb);

char	*ft_strrchr(char *dst, int sumb);

char	*ft_strnstr(const char *big, const char *little, size_t len);

char	*ft_strdup(const char *str);

char	*ft_substr(char const *s, unsigned int start, size_t len);

char	*ft_strjoin(char const *s1, char const *s2);

char	*ft_itoa(int n);

char	*ft_strmapi(char const *s, char (*f)(unsigned int, char));

char	*ft_strtrim(char const *str, char const *set);

char	**ft_split(char const *s, char c);

int	ft_memcmp(const void *buf1, const void *buf2, size_t count);

int	ft_strncmp(const char *str1, const char *str2, size_t n);

int	ft_strlen(char *str);

int	ft_isalpha(int ch);

int	ft_isdigit(int ch);

int	ft_isalnum(int ch);

int	ft_isascii(int ch);

int	ft_isprint(int ch);

int	ft_toupper(int ch);

int	ft_tolower(int ch);

int	ft_atoi(const char *str);

void	*kl_malloc(size_t size);

void	kl_end(char *str, int exit_code);

void	kl_free_arr(void *arr);

char	*kl_strdup_len(const char *str, size_t len);

char	*kl_strjoin_free(char *s1, char *s2);

typedef struct  s_dlst
{
    void            *content;
    struct s_dlst   *next;
    struct s_dlst   *prev;
}               t_dlst;

t_dlst	*dlst_new(void *content);

t_dlst	*dlst_last_node(t_dlst *lst);

void	dlst_add_front(t_dlst **s_dlst_src, t_dlst *s_dlst_new);

void	dlst_add_back(t_dlst **s_dlst_src, t_dlst *new);

void	dlst_remove_node(t_dlst	*node);

void	dlst_loop(t_dlst **s_dlst);

void	dlst_map(t_dlst *s_dlst, void (*func)(void *));

void	dlst_free(t_dlst *s_dlst);