/*  A spoonerism is when the first letters / sounds of two words are
 *  transposed onto one another. Create a function that takes a two-word
 *  string and performs a spoonerism on the phrase.
 *  notes for project
 *  *  Only two words will be parsed into the function. Don't worry about
 *     handling more than two.
 *  *  You won't always just have to swap the first letters,
 *     take care to notice which letters have been switched in the examples
 *     (notice the difference between vowel-starting and consonant-starting words).
 */
bool isVowel(char c){
    c = tolower(c);
    return (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
}
std::string spoonerise(std::string phrase) {
    //  split the phrase into two words
    std::size_t p = phrase.find(' ');
    std::string fw = phrase.substr(0,p), sw = phrase.substr(p+1);
    //  define two prefixes
    std::string fp = "", sp = "";
    //  remove characters off 1st word, put into prefix 1.
        while(!isVowel(fw[0])){
            fp.push_back(fw[0]);
            fw.erase(fw.begin());
        }
    //  remove characters off 2nd word, put into prefix 2.
    while(!isVowel(sw[0])){
            sp.push_back(sw[0]);
            sw.erase(sw.begin());
        }
    return sp + fw + ' ' + fp + sw;
}