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#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#define SIZE 80


int main() {
	FILE* file_ptr;
	file_ptr = fopen("book.txt", "r");

	char Harry[] = "harry";
	int len_h = strlen(Harry);
	char Potter[] = "potter";
	int len_p = strlen(Potter);
	char Harry_Potter[] = "harry potter";
	int len_hp = strlen(Harry_Potter);
	char boy_who_lived[] = "boy who lived";
	int len_bwl = strlen(boy_who_lived);

	int c_Harry = 0;
	int c_Potter = 0;
	int c_Harry_Potter = 0;
	int c_boy_who_lived = 0;

	char str[SIZE];


	if (file_ptr != NULL) {
		printf("File was found\n");
		while (fgets(str, SIZE, file_ptr) != NULL) {
			int i = 0, j = 0;
			int len_str = strlen(str);
			_strlwr(str);

			while ((i <= len_str - len_h) & (j < len_h) || (i <= len_str - len_p) & (j < len_p) || (i <= len_str - len_bwl) & (j < len_bwl)){
				if (str[i + j] == Harry[j]) {
					j++;
					if (j == len_h) {
						c_Harry++;
						i++;
						j = 0;
					}
				}
				else if (str[i + j] == Potter[j]) {
					j++;
					if (j == len_p) {
						c_Potter++;
						i++;
						j = 0;
					}
				}
				else if (str[i + j] == boy_who_lived[j]) {
					j++;
					if (j == len_bwl) {
						c_boy_who_lived++;
						i++;
						j = 0;
					}
				}
				else {
					i++;
					j = 0;
				}
			}
		}

	}
	else {
		printf("file not found");
	}

	printf("Harry: %d\n", c_Harry);
	printf("Potter: %d\n", c_Potter);
	printf("Boy who lived: %d\n", c_boy_who_lived);
	return 0;
}