public static char toCloseChar(char c) {
		int result = c;
		if (c >= '1' && c <= '9') {
			result = '①' + c - '1';
		} else if (c >= 'A' && c <= 'Z') {
			result = 'Ⓐ' + c - 'A';
		} else if (c >= 'a' && c <= 'z') {
			result = 'ⓐ' + c - 'a';
		}
		return (char) result;
	}
@Test
	public void toCloseCharTest(){
		assertEquals('②', CharUtil.toCloseChar('2'));
		assertEquals('Ⓜ', CharUtil.toCloseChar('M'));
		assertEquals('ⓡ', CharUtil.toCloseChar('r'));
	}