text: #include <assert.h>
  #include <stddef.h>
  #include "utility.h"
  
  // please implement function here
  void reverse_array(int *arr, size_t len) {
      // reverse array in-place (i.e. without allocating memory)
  }
  
  int main() {
      int arr[] = {1,5,2,6,7,2,9,10};
      size_t len = sizeof(arr) / sizeof(arr[0]); // please don't use it for non-static arrays
      print_array_int(arr, len);
      reverse_array(arr, len);
      print_array_int(arr, len);
  }
  