#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void) {

  FILE *file;
  size_t length;
  char text[500], message[500];
  int i;

  file = fopen("messageIA.txt", "r");

  if (file == NULL) {
    printf("failed reading file");
    return EXIT_FAILURE;
  }

  fgets(text, sizeof(text), file);

  length = strlen(text);

  for (i = 0; i < length; i += 3) {
    strncat(message, &text[i], 1);
  }

  /* I've normalized the file input so o is ô & e is é */
  printf("%s", message);

  fclose(file);

  return EXIT_SUCCESS;
}