reverse.c

#include <stdio.h>
#include <stdint.h>

int main(int l, char **a) {
  for(int i = l/2 + 1; --i; a[i] = (void*)(((uintptr_t)a[i]+(uintptr_t)a[l-i])-(uintptr_t)(a[l-i]=a[i])));

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

  return 0;
}