OMQq9n - Online C++ Compiler & Debugging Tool

#include <iostream>
#include <string>
using namespace std;
void modify(string& s) {
    string result = "";
    string word = "";
    string clean = "";
    for (char c : s) {
        if (c == '%') clean += '!!';
        else if (c == '$') clean += '&';
        else if (c == '&') clean += '*';
        else clean += c;
    }
    for (int i = 0; i <= clean.size(); i++) {
        if (i == clean.size() || clean[i] == ' ') {
            if (word.find('*') == string::npos && word.find("!!") == string::npos && word.find("&") == string::npos) {
                for (int j = 0; j < word.size(); j++) {
                    word[j] = toupper(word[j]);
                }
            }
            result += word + " ";
            word = "";
        }
        else {
            word += clean[i];
        }
    }
    s = result;
}
int main() {
    string s;
    getline(cin, s);
    modify(s);
    cout << s;
    return 0;
}