// this is the problem
for(i = 0; (c = getchar()) != EOF; ++i) {
    if (c == 't') {
      for (n = i; n < (TAB + n); n++) {
        s[n] = ' ';
      }
      i = n;
    }

#define MAXLINE 1000
#define TAB 8

int main (void)
{
  int c, i, j, n, counter;

  int s[MAXLINE] = {0};

  counter = 0;
  for(i = 0; (c = getchar()) != EOF; ++i) {
    if (c == 't') {
      for (n = i; n < (TAB + n); n++) {
        s[n] = ' ';
      }
      i = n;
    }
    if (counter++ == COLUMN) {
      s[i++] = c;
      s[i] = 'n';
      counter = 0;
    }
    else {
      s[i] = c;
    }
  }

  // print array
  for(j = 0; j < i; ++j) {
    putchar(s[j]);
  }

}