Разбить строку

#include <iostream>
#include <vector>
#include <string>
 
int main(int argc, char *argv[]){
    std::string str = "adlkalsdkmalksdfmlkasmflkasmdflkmaslfkmalskdfmanjdfgkjhdbgjhsdbgkjehrgbkjsdhbgjdgb,sdnmgbs,dfgsdfghbsjdghbskdjghbksghbkslkasdflkasdflkasldfkmalsdkflksdflgksmdlfgkmsd;flgkmsd;fglksdf;glksldkfmlskdfmlsk";
    std::vector<std::string> strings( 10 );
    int c = 0;
    for ( int i = 0; i < 200; i += 20 ){
        strings[c] = str.substr( i, 20 );
        c++;
    }
    for ( int i = 0; i < strings.size(); i++ ){
        std::cout << strings[i] << std::endl;
    }
    return 0;
}

#include <conio.h>
#include <iostream>
#include <cstring> 
#include <windows.h>
using namespace std;
 
void replace(string &str) //my function
{
 string st1 = "ED", st2 = "ing";
 while(str.find(st1) != -1){
   str.replace(str.find(st1,0), st1.length(), st2); //function replace text of string.
 }
}
int main()
{
 
 string str="I am goED to school"; // initial text
 cout << "Строка:" ;
 cout << str<< endl;
 cout << "Result:" ;
 replace(str);  // result text after replacement
 cout << str<< endl;
getch();
 
}

#include <iostream>
#include <string> 
#include <conio.h>
#include <clocale>
 
void replace(std::string &str){
    std::string st1 = "ED", st2 = "ing";
    while(str.find(st1) != -1){
        str.replace(str.find(st1,0), st1.length(), st2); //function replace text of string.
    }
}
int main(){
    setlocale( LC_ALL, "Russian" );
    std::string str = ""; //I am goED to school"; // initial text
    std::getline( std::cin, str );
    std::cout << "Строка:" ;
    std::cout << str << std::endl;
    std::cout << "Result:" ;
    replace(str); // result text after replacement
    std::cout << str << std::endl;
    getch();
}