private static char[] removeFrontZero(char[] number, boolean minus) {
		int i=0;
		for(;i<number.length;i++) {
			if(number[i]!='0' && number[i]!='\u0000') {
				break;
			}
		}
		
		if(i==number.length) {
			return "0".toCharArray();
		} 
		
		number = Arrays.copyOfRange(number, i, number.length);
		if(minus){
			number = Arrays.copyOf(number, number.length+1);
			for(int j=number.length-2;j>=0;j--) {
				number[j+1] = number[j];
			}
			number[0] = '-';
		}
		
		return number;
	}