how to find a line in a string in C++

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C++

#include<iostream>
#include<string>


using namespace std;

int main(){
string sSentence;
sSentence = "this is a string";

int iVowel = sSentence.find_first_of("aeiou");

while(iVowel!=string::npos){

}
}

so this is the unfinished code.

The program that was tasked of us was so make a program about piglatin:

first find the first vowel of a word
put all the characters before the first vowel after the last letter of the sentence then add "ay"
example: coding ==== odingcay

Problems:
1. after finding the first vowel, how do I get the characters before the first vowel.

2. after translating the word, how do I jump to the next word. (I was thinking of using the blank space as the starting point when finding the next first vowel of the word but I dont know how to find that space).

pls help. thank you :)