編寫函數，將一個字符串中元音字母複製到另一字符串中，然後輸出。

#include <stdio.h>

void cpy(char src[], char dest[]) {
    int i, j;
    for (i = 0, j = 0; src[i] != '\0'; i++)
        if (src[i] == 'a' || src[i] == 'A' ||
            src[i] == 'e' || src[i] == 'E' ||
            src[i] == 'i' || src[i] == 'I' ||
            src[i] == 'o' || src[i] == 'O' ||
            src[i] == 'u' || src[i] == 'U') {
            dest[j] = src[i];
            j++;
        }
    dest[j] = '\0';
}

void main() {
    char src[80], dest[80];
    gets(src);
    cpy(src, dest);
    puts(dest);
}