C++ (1) Prompt the user for a string that contains two strings separated by a comma• Examples of strings that can be accepted:• Jill, Allen• Jill, Allen• Jill,AllenEx:Enter input string:Jill, Allen(2) Print an error message if the input string does not contain a comma. Continue to prompt until a valid string is entered. Note: If the inputcontains a comma, then assume that the input also contains two strings.Ex:Enter input string:Jill AllenError: No comma in string.Enter i nnut. strina:hming Fundamentals home > 9.11: LAB: Warm up: Parsing stringsE zyBooks catal(3) Extract the two words from the input string and remove any spaces. Store the strings in two separate variables and output the strings.Ex:Enter input string:Jill, AllenFirst word: JillSecond word: Allen(4) Using a loop, extend the program to handle multiple lines of input. Continue until the user enters q to quit.Ex:Enter input string:Jill, AllenFirst word: JillSecond word: AllenEnter input string:Golden , MonkeyFirst word: GoldenSecond word: MonkeyEnter input string:Washington, DCFirst word: WashingtonSecond word: DCEnter input string:

Function checkComma() checks if string contains comma or not. If string contains comma it will send its index, if it doesnot function returns -1. Inside the main(), user is asked to enter a string. Using checkComma() function, validity of the string is checked. If string contains comma, substr() function is used get two substrings. remove() function is used to remove all whitespace from both the substrings.#include <iostream>#include <algorithm>using namespace std; int checkComma(string str){ int index = -1; //Assuming string doesnot contain comma. for(int i=0;i<str.length();i++) { if(str[i] == ',') { index = i; break; } } return index;} int main(){ string str; while(true) { cout<<"\nEnter input string: "; getline(cin,str); if(str == "q") break; int indexComma = checkComma(str); if(indexComma == -1) { cout<<"Error: no comma in string.\n"; continue; } else { //Comma is present in the string //Lets spilt the string. int len = str.length(); string firstname = str.substr(0,indexComma-1); string lastname = str.substr(indexComma+1, len); //Remove whitespace from firstname and lastname firstname.erase(remove(firstname.begin(), firstname.end(), ' '), firstname.end()); lastname.erase(remove(lastname.begin(), lastname.end(), ' '), lastname.end()); cout<<"First word: "<<firstname; cout<<"\nSecond word: "<<lastname<<endl; } } return 0;}