#include <stdio.h>
#include <stdlib.h>

#define LEN 100

void new_line(char (**line)[LEN], int n) {
    *line = calloc(n * LEN, sizeof(char));

    for (int i = 0; i < n; i++) {
        sprintf((*line)[i], "test %d", i);
    }
}

int main(void) {
    const int n = 10;

    char (*line)[LEN] = { NULL };

    new_line(&line, n);

    for (int i = 0; i < n; i++) {
        printf("%s\n", line[i]);
    }

    return EXIT_SUCCESS;
}