#include <assert.h>
#include <stdio.h>

int main()
{
    FILE *file = fopen("/sandbox/subdir2/input_link.txt", "r");
    assert(file != NULL);

    char c = fgetc(file);
    while (c != EOF) {
        assert(fputc(c, stdout) != EOF);
        c = fgetc(file);
    }
}