c++字符向量，删除包含数字的单词，并在错误单词后加上空格

#include <iostream>
#include <vector>
#include <string>
#include <cctype>

int main() {
    std::vector<std::string> words = {"hello", "world123", "foo", "bar456"};

    for (auto it = words.begin(); it != words.end(); ) {
        bool containsDigit = false;
        for (char c : *it) {
            if (std::isdigit(c)) {
                containsDigit = true;
                break;
            }
        }

        if (containsDigit) {
            it = words.erase(it);
        } else {
            if (!std::isalpha((*it).back())) {
                (*it).push_back(' ');
            }
            ++it;
        }
    }

    for (const std::string& word : words) {
        std::cout << word << std::endl;
    }

    return 0;
}

hello
foo