在字符串C++中的字符之间添加空格

#include <iostream>
#include <string>

std::string addSpaces(const std::string& input) {
    std::string result;
    for (size_t i = 0; i < input.length(); ++i) {
        result += input[i];
        if (i < input.length() - 1) {
            result += ' ';
        }
    }
    return result;
}

int main() {
    std::string original = "HelloWorld";
    std::string spaced = addSpaces(original);
    std::cout << "Original: " << original << std::endl;
    std::cout << "Spaced: " << spaced << std::endl;
    return 0;
}