remove duplicate characters in a string c++ stl code example

Example 1: c++ remove whitespace from string

#include <algorithm>

int main()
{
    std::string str = "H e l l o";
    str.erase(remove(str.begin(), str.end(), ' '), str.end());
    std::cout << str; // Output Hello
    
    return 0;
}

Example 2: removing repeated characters in a string c++

s.erase(std::unique(s.begin(), s.end()), s.end());