//https://www.codewars.com/kata/53697be005f803751e0015aa

//write function to replace all the lowercase vowels in a given string with numbers and function to turn to back

#include <string>

#include <algorithm>

#include <unordered_map>

const std::unordered_map<char, char> encode_replacements = {

{'a', '1'},

{'e', '2'},

{'i', '3'},

{'o', '4'},

{'u', '5'},

};

const std::unordered_map<char, char> decode_replacements = {

{'1', 'a'},

{'2', 'e'},

{'3', 'i'},

{'4', 'o'},

{'5', 'u'},

};

std::string impl(const std::string& str, const std::unordered_map<char, char>& repl) {

std::string output{str};

std::for_each(output.begin(), output.end(), [&repl](char& ch) {

if (repl.find(ch) != repl.end()) {

ch = repl.at(ch);

}

});

return output;

}

std::string encode(const std::string& str) {

return impl(str, encode_replacements);

}

std::string decode(const std::string& str) {

return impl(str, decode_replacements);

};