I'm having a problem with string methods

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C++

I made this code that is supposed to receive a string of "Last, First MI" and it's supposed to return it in "First MI Last". It's supposed to read it using call by reference and return it on call by value.

It is also supposed to separate the values of last, first, and MI. and use find() to take out the commas and then concatenate them back up


This is what I have but I'm getting a compile error

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

void inputData(string &); //Declare Call-by-reference function
void outputData(string); //Declare Call-by-value function

int main() {

	string myString;

	inputData(myString);
	outputData(myString);
}

void inputData(string &myString) {
    cout << "Last, First, MI : ";
    getline( cin, myString );
    istringstream parse( myString );
    string first, mi, last, fullname;
    int index;
    index = myString.find_last_of(' ');
    last = myString.substring(0, index);
    mi = myString.substring(index+1, index);
    first = myString.substring(index+1);
    fullname = first + mi + last;
    cout << fullname << " by reference " << endl; //Pass-by-reference*
}


void outputData(string myString) {
    cout << myString << " by value " << endl; //Pass-by-value
}

error is on

last = myString.substring(0, index);
mi = myString.substring(index+1, index);
first = myString.substring(index+1);

error is

In function 'void inputData(std::string&)':|
|25|error: 'struct std::basic_string<char, std::char_traits<char>, std::allocator<char> >' has no member named 'substring'|
|26|error: 'struct std::basic_string<char, std::char_traits<char>, std::allocator<char> >' has no member named 'substring'|
|27|error: 'struct std::basic_string<char, std::char_traits<char>, std::allocator<char> >' has no member named 'substring'|
||=== Build finished: 3 errors, 0 warnings ===|

Thanks in advance,

sorry,

Thanks