#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)
{
        char (*line)[LEN] = NULL;
        int n = 10;

        new_line(line, n);

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

    return 0;
}