Remove white space at the end of the output in C

Question

The following code is for printing the elements of a matrix in spiral order. The program works fine. The problem, however, is that the online compiler against which I\'m checkin

Answer 1

An answer after accepted answer:

Rather than:

while (k < m && l < n) {
  ...
  printf("%d ", a[k][i]);
  ...
  printf("%d ", a[i][n-1]);
  ...
  printf("%d ", a[m-1][i]);
  ...
  printf("%d ", a[i][l]);
  ...
}

Change the format.

const char *format = "%d";
while (k < m && l < n) {
  ...
  printf(format, a[k][i]);
  format = " %d";
  ...
  printf(format, a[i][n-1]);
  ...
  printf(format, a[m-1][i]);
  ...
  printf(format, a[i][l]);
  ...
}
fputc('\n', stdout); // if desired.