rem: void kputs(const char *str)
add: kputs(const char *str)
context: void kputs(const char *str){	while (*str) {		if (*str == '\n') {			line++;			if(line > SCREEN_HEIGHT - 1)				scrup();			else				screenOffset += SCREEN_WIDTH - (screenOffset % 80);		} else {			kScreenBase[screenOffset++] = 0xf00 | *str;		}		if (screenOffset > SCREEN_WIDTH * SCREEN_HEIGHT)			scrup();		str++;	}}