split exercise for école thirty four

ft_split.c

#include <stdlib.h>
#include <printf.h>

int is_seperator(char c) {
    return (c == '\0' || c == ' ' || c == '\n');
}

int word_length(char *str) {
    int i;

    i = 0;
    while (!is_seperator(str[i]))
        i++;
    return i;
}

char *ft_duplicate(char *str, int size) {
    int i;
    char *res;

    res = malloc(sizeof(char *) * size);
    if (!res)
        return 0;

    i = 0;
    while (i < size - 1) {
        res[i] = str[i];
        i++;
    }
    res[i] = 0;
    return res;
}

int count_words(char *str) {
    int i;
    int count;

    count = 0;
    while (*str) {
        i = 0;
        while (str[i] && is_seperator(str[i]))
            i++;
        if (str[i])
            count++;
        while (str[i] && !is_seperator(str[i]))
            i++;
        str += i;
    }
    return count;
}

char	**ft_split(char *str) {
    int word_amount = count_words(str);
    char **result = malloc(sizeof (char *) * word_amount);

    int i;
    int word_index = 0;
    while (*str) {
        i = 0;
        while (str[i] && is_seperator(str[i]))
            i++;
        if (str[i]) {
            int size = word_length(str + i) + 1;
            result[word_index++] = ft_duplicate(str + i, size);
        }
        while (str[i] && !is_seperator(str[i]))
            i++;
        str += i;
    }
    return result;
}

int main() {
    char test[] = "           this                is            a           test        ";
    char **map = ft_split(test);
    printf("1 -> %s\n", map[0]);
    printf("2 -> %s\n", map[1]);
    printf("3 -> %s\n", map[2]);
    printf("4 -> %s\n", map[3]);
}