#include <ctype.h>
char* serpentino_encode(const char* s) {
	unsigned int i = 0,vocali=0,consonanti=0;
	while (s[i] != 0) {
		if (isalpha(s[i])||isprint(s[i]) || isspace(s[i])) {
			switch (s[i]) {
			case 'a': vocali++; break;
			case 'e': vocali++; break;
			case 'i': vocali++; break;
			case 'o': vocali++; break;
			case 'u': vocali++; break;
			default:consonanti++; break;
			}
		}
		i++;
	}
	int lungs2 = vocali * 3 + consonanti+1;
	char *s2=malloc(lungs2*sizeof(char));
	i = 0;
	int j = 0;
	while (s[i] != 0) {
		if (isalpha(s[i]) || isprint(s[i]) || isspace(s[i])) {
			switch (s[i]) {
			case 'a': {
				for (int k = 0; k < 3; k++) {
					if (k == 1) {
						s2[j] = 's';
					}
					else {
						s2[j] = 'a';
					}
					j++;
				}
			}; break;
			case 'e': {
				for (int k = 0; k < 3; k++) {
					if (k == 1) {
						s2[j] = 's';
					}
					else {
						s2[j] = 'e';
					}
					j++;
				}
			}; break;
			case 'i': {
				for (int k = 0; k < 3; k++) {
					if (k == 1) {
						s2[j] = 's';
					}
					else {
						s2[j] = 'i';
					}j++;
				}
			}; break;
			case 'o': {
				for (int k = 0; k < 3; k++) {
					if (k == 1) {
						s2[j] = 's';
					}
					else {
						s2[j] = 'o';
					}
					j++;
				}
			}; break;
			case 'u':{
				for (int k = 0; k < 3; k++) {
					if (k == 1) {
						s2[j] = 's';
					}
					else {
						s2[j] = 'u';
					}
					j++;
				}
			}; break;
			default:s2[j] = s[i];j++; break;
			}
		}
		i++;
	}
	s2[j] = 0;
	return s2;
}