24. Reverse String C++

#include <iostream>
#include <string>

void ReverseString(std::string&);

int main()
{
    std::string s;
    std::cin >> s;

    ReverseString(s);

    std::cout << s << std::endl;

    return 0;
}

void ReverseString(std::string& s)
{
    for (int i = 0; i < s.length() / 2; ++i)
    {
        char ch = s[i];
        s[i] = s[s.length() - i - 1];
        s[s.length() - i - 1] = ch;
    }
}