void to_up char buff for int buff if buff buff buff return void to_dow

void to_up(char *buff){
	for(int i=0;buff[i];i++){
		if(buff[i]>='a' && buff[i]<='z')buff[i]+='A'-'a';
	}
	return;	
}

void to_down(char *buff){
	for(int i=0;buff[i];i++){
		if(buff[i]>='A' && buff[i]<='Z')buff[i]-='A'-'a';
	}
	return;		
}

void revers(char *buff){
	int lenght=strlen(buff);
	char t;
	for(int i=0;i<=lenght/2;i++){
		t=buff[i];
		buff[i]=buff[lenght-1-i];
		buff[lenght-1-i]=t;
	}
	
	return;	
}

int isVowl(char ch){
	char vowles[]="eyuioa";
	for(int i=0;vowles[i];i++)if(vowles[i]==ch)return 1;
	return 0;
}

int count_vowles(char *buff){
	
	int num=0;
	
	for(int i=0;buff[i];i++){
		if(isVowl(buff[i]))num++;
	}
	return num;
}

void erase_spases(char *buff){
	for(int i=0;buff[i];i++){
		if(buff[i]==' ')
			for(int j=i;buff[j];j++)buff[j]=buff[j+1];
	}
	return;
}