Как улучшить код в плане читаемости?

/*
 * Maximize a-b
 */

#include <stdio.h>
#include <stdlib.h>

int maximize(int number);  /* 9876543210 */
int minimize(int number);  /* 1023456789 */
int get_count_of_digits(int num);
int cmp(const void *a, const void *b);
void itoa(int number, int length, int arr[]);
int atoi_(int s[], int length);
void reverse(int s[], int length);



int main()
{
	int a,b;
	int result_a, result_b;

	scanf("%d\n%d", &a, &b);

	result_a = (a<0) ? minimize(a) : maximize(a);
	result_b = (b<0) ? maximize(b) : minimize(b); 

	printf("%d\n", result_a - result_b);

	return 0;
}

int minimize(int number){
	int sign,zeros = 0, flag = 0, j = 0;
	int length = get_count_of_digits(number);
	int string[length], result[length], res;
	if ((sign = number) < 0)
		number = -number;
	if (number == 0)
		return 0;
	itoa(number, length, string);

	qsort(string, length, sizeof(int),  cmp);

	for (int i = 0; i < length; i++){
		if (string[i] != 0){
			flag = 1;
			result[j++] = string[i];
		}
		if (string[i] == 0 && flag == 0)
			zeros++;
		else if (flag == 1 && zeros){
			while (zeros-- > 0)
				result[j++] = 0;
		}
	}

	res = atoi_(result, length);
	if (sign < 0)
		res = -res;
	return res;
}


int maximize(int number){
	int sign,zeros = 0, flag = 0, j = 0;
	int length = get_count_of_digits(number);
	int string[length], result;
	if ((sign = number) < 0)
		number = -number;
	if (number == 0)
		return 0;
	itoa(number, length, string);

	qsort(string, length, sizeof(int),  cmp);
	reverse(string, length);
	result = atoi_(string, length);

	if (sign < 0)
		result = -result;

	return result;
}


int cmp(const void *a, const void *b) {
    return *(int*)a - *(int*)b;
}



int get_count_of_digits(int num){
	int count = (num == 0) ? 1 : 0;
	while (num){
		count++;
		num /= 10;
	}

	return count;
}

void itoa(int n, int length, int arr[]){
	int i = 0;	

	do {
		arr[i++] = n % 10;
	} while ((n/=10) > 0);

	arr[i] = '\0';
	reverse(arr, length);
}

 void reverse(int s[], int length)
 {
     int i, j;
     int c;
 
     for (i = 0, j = length-1; i<j; i++, j--) {
         c = s[i];
         s[i] = s[j];
         s[j] = c;
     }
 }



int atoi_(int s[], int length){
	int n = 0;
	for (int i = 0; i<length;i++){
		n *= 10;
		n += s[i];
	}	
	return n;

}