Challenge dealview.c

#include <stdio.h>
#include <iostream>

bool a(std::string& str, const std::string& from, const std::string& to) {
    size_t start_pos = str.find(from);
    if(start_pos == std::string::npos)
        return false;
    str.replace(start_pos, from.length(), to);
    return true;
}
void replace(std::string& str, const std::string& from, const std::string& to) {
    if(from.empty())
        return;
    size_t start_pos = 0;
    while((start_pos = str.find(from, start_pos)) != std::string::npos) {
        str.replace(start_pos, from.length(), to);
        start_pos += to.length();
    }
}


int main(){
	char ch;
	std::string FILENAME;
	printf("\033[1;33;40m******************************\nWelcome to the International Dealing Program - v2\n******************************\n");
	
	printf("We fixed the directory traversal from last year so they can't hack us anymore.\n");
	while(1){

		printf("Enter the country deals you want to see :\nExample: Kosovo, Albania or provide other country.\nCountry > ");

		// Read the file
		std::cin >> FILENAME;

		
		replace(FILENAME, "../", "");
		FILENAME = "/tmp/" + FILENAME ;
		FILENAME.append(".txt");

		FILE *fp=fopen(FILENAME.c_str(), "r");
		if(fp == NULL){
			perror("Failed");
			return 0;
			}

		while((ch = fgetc(fp)) != EOF){
			printf("%c", ch);
		}
		fclose(fp);

	}
	return 0;
}