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

int isPalindrome(char *str);

int main(void) {

  FILE *file = fopen("palindrome.txt", "r");
  char *token, line[512];

  if (file == NULL) {
    perror("Error opening file");
    return EXIT_FAILURE;
  }

  while (fgets(line, sizeof(line), file)) {

    token = strtok(line, ",");

    while (token != NULL) {
      if (isPalindrome(token)) {
        printf("palindrome found: %s\n", token);
      }
      token = strtok(NULL, ",");
    }
  }

  fclose(file);

  return EXIT_SUCCESS;
}

int isPalindrome(char *str) {
  int i, length = strlen(str);

  for (i = 0; i < length / 2; i++) {
    if (tolower(str[i]) != tolower(str[length - 1 - i])) {
      return 0;
    }
  }

  return 1;
}