reverse.c

#include <stdio.h>

int main(int l, char **a) {
  for(int i = 0; i < l/2; a[++i] = (((int)a[i]+(int)a[l-i])-(int)(a[l-i]=a[i])) );

  for(int i = 1; i < l; ++i)
    printf("%s ", a[i]);

  return 0;
}