int main()
{
	// create a file
	const string f = "./mumble.txt";
	file_write(f,"Many mumbling mice",0);
	file_append(f,"\nAre making merry music in the moonlight!",0);
	file_append(f,"\nMighty nice!",0);
	
	// check file length
	long l = file_length(f), l2 = 0;
	printf("\nlength: %d",l);
	
	// allocate memory for reading the file into a string
	char* str = malloc(l+1);
	memset(str,0,l+1);
	
	// fill the string with data and check how much data was copied
	l2 = file_read(f,str,l+1);
	printf("\nlength2: %d",l2);
	
	// let's see where the newline characters are
	int i = 0;
	for(i = 0; i<l; i++)
	{
		if(str[i]=='\n') printf("\ni: %d, found newline!",i);
	}
	// let's print the string
	printf("\n%s",str);
	
	// let's find the last newline character (if not found, zero)
	for(i = l-1; i>0; i--)
	{
		if(str[i]=='\n') {break;}
	}
	// point to the last part of the string by offsetting the pointer
	char* lastline = str + i;
	printf("%s",lastline);
	
	// okay, now let's alter the original string to convert it into the first line only.
	// Remember, a string is all data before a null character.
	for(i=0; i<l; i++)
	{
		if(str[i]=='\n') {str[i]=0;break;}
	}
	// let's print the altered string (first line)
	printf("\n%s",str);
	
	
	// always free memory after using malloc
	free(str);
	return 0;
}