#include <stdio.h>
#define BUF_LEN 128

void task1() {
%puts("===== task1 =====");

%char infilepath[] = "files/text1.txt";
%FILE* fin = fopen(infilepath, "r");
%if (fin == NULL) {
%%printf("Cannot open file %s\n", infilepath);
%%return;
%}

%char outfilepath[] = "files/out1.txt";
%FILE* fout = fopen(outfilepath, "w");
%if (fin == NULL) {
%%printf("Cannot open file %s\n", outfilepath);
%%return;
%}

%char buf[BUF_LEN];
%while (fgets(buf, BUF_LEN, fin) != NULL) {
%%for (int i = 0; buf[i] != '\0'; i++) {
%%%if (buf[i] == '\t') {
%%%%buf[i] = '%';
%%%}
%%}
%%fprintf(fout, "%s", buf);
%%printf(">>%s<<", buf);
%}
%fclose(fin);
%fclose(fout);
}

int main() {

%task1();



%return 0;
}