#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// This is an old example from 2/28/2024 to illustrate the use of *a_pos.

// Okay to copy/adapt if you understand BUT not likely to be helpful on HW09.

/*
The rabid panther roller skates through malt shakes.
   ▲
   pos
 */
const char END_CHAR = '\0';

bool is_vowel(char ch) {
    return ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u';
}

char find_next_vowel(char** a_pos) {
    while(!is_vowel(**a_pos)) {
        if(**a_pos == '\0') {
            return END_CHAR;
        }

        *a_pos += 1;  // ← IMPORTANT PART - same concept as homework but slightly diff code
    }
    char vowel = **a_pos;
    *a_pos += 1;  // put cursor in position we will want for next time
    return vowel;
}

int main(int argc, char* argv[]) {
    char* s = "The rabid panther roller skates through malt shakes.";
    char* pos = s;  //  same as:  char* pos = s;
    for(char ch = find_next_vowel(&pos); ch != END_CHAR; ch = find_next_vowel(&pos)) {
        printf("Next vowel:  '%c'   Rest of string: \"%s\"\n", ch, pos);
    }
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */