#include <expected>
#include <fstream>
#include <iostream>
#include <map>
#include <string>
#include <vector>
#include <cstring>

std::vector<std::string> split(std::string s, std::string delimiters) {
        std::vector<std::string> tokens;
        size_t last = 0, next = 0;
        while ((next = s.find_first_of(delimiters, last)) != std::string::npos) {
                if (next != last) tokens.push_back(s.substr(last, next - last));
                last = next + 1;
        }
        if (last < s.length()) tokens.push_back(s.substr(last));
        return tokens;
}

std::string trim(std::string& source) {
        auto line = source;
        std::string whitespaces(" \t\n\r\f\v");
        line.erase(0, line.find_first_not_of(whitespaces));
        line.erase(line.find_last_not_of(whitespaces) + 1);
        return line;
}

std::expected<int, std::string> strtoint (std::string source) {
        std::size_t pos{};
        int res;
        try {
                res = std::stoi(source, &pos);
        } catch (std::invalid_argument const& ex) {
                return std::unexpected(std::format("invalid argument:{}",  ex.what()));
        } catch (std::out_of_range const& ex) {
                return std::unexpected(std::format("out of range", ex.what()));
        }
        return res;
}