ex_4

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

#define MAX_LEN 1000

int i;
int check_vowel(char a)
{
    //printf("%s %c\n", __FUNCTION__, a);
    if (a >= 'A' && a <= 'Z')
        a = a + 'a' - 'A';

    if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
        return 1;

    return 0;
}


char* toggleMarginalVowels(char s[]){
    int last_pos = 0;

    for(i; s[i] != '\0'; i++){
        if(check_vowel(s[i]) == 1){
            if(islower(s[i])){
                s[i] = toupper(s[i]);
                }
            else
                s[i] = tolower(s[i]);
            while(!isspace(s[i])){
                if(check_vowel(s[i]) == 1)
                    last_pos = i;
                i++;
            }
            if(islower(s[last_pos])){
                s[last_pos] = toupper(s[last_pos]);
                //printf("upper*  ");
                }
            else
                s[last_pos] = tolower(s[last_pos]);

        }

    }
    printf("%s \n", s);
}


int main()
{
    char string[MAX_LEN] = "This is a good one";
    toggleMarginalVowels(string);

}