큰수 작은수로 정렬후 덧셈

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#define MAX_STR_SIZE 100
void bubble(char a[], int n);
void rebubble(char b[], int n);
void swap(char *, char *);
void showstream(char a[]);
void sum(char big[],char small[]);
void reverse(char a[]);
void ncarry(int n,int end);
void whatbubblein(char a[],char b[]);
void input_string();
char result[MAX_STR_SIZE];
char str_before[MAX_STR_SIZE];

int main() {
  char str_after[MAX_STR_SIZE];
  printf("Input Any Number : ");
  input_string();
  strcpy(str_after,str_before);
  bubble(str_before,(int)strlen(str_before));
  rebubble(str_after,(int)strlen(str_before));
  sum(str_before,str_after);
  reverse(result);
  printf("result : ");
  showstream(result);
  return 0;
}

void input_string(){
  char str_after[MAX_STR_SIZE];
  char str_read[MAX_STR_SIZE];
  int i,j,k=0;
  fgets(str_read , MAX_STR_SIZE,stdin);
  for (int i = 0; i < strlen(str_read); ++i)
  {
    if(str_read[i]==10){
      str_before[k] ='\0';
    }

    if(str_read[i]!=32 && str_read[i]!=10){  //32 space bar
      str_before[k]=str_read[i];
      k++;
    }
  }
}

void bubble(char a[], int n)		
{        /* n is the size of a[] */

  int i, j,k;
  for (i = 0; i < n - 1; ++i){
    for (j = n - 1; j > i; --j){
      if (a[j-1] > a[j]){
        swap(&a[j-1], &a[j]);
      }
    }
  }
}

void rebubble(char b[], int n){
  int i,j,k=0;
  for (i = 0; i < n - 1; ++i){
    for (j = n - 1; j > i; --j){
      if (b[j-1] < b[j] ){
        swap(&b[j-1], &b[j]);
      }
    }
  }
}

void swap(char *p,char *q){
  static char cnt=1;
  char temp=*p;
  *p=*q;
  *q=temp;
  cnt++;
}

void showstream(char a[]){
  puts(a);
}

void sum(char big[],char small[]){
  char temp[MAX_STR_SIZE];
  int i,j,k;
  static int count=0;
  int leng,carry=0;
  leng = (int)(strlen(big));
  for (int i = 0; i < leng; ++i)
  {

    temp[i]=(big[leng-1-i]+small[leng-1-i])-48;
    if(carry==1){
      result[i]=1+temp[i];
      carry = 0;
      if(result[i]>=58){
        result[i]=result[i]-10;
        result[i+1]=result[i+1]+49;
        ncarry(count,i);
        carry=1;
      }
    }
    else{
      if(temp[i]>=58){
        result[i]=temp[i]-10;
        carry=1;
        ncarry(count,i);
      }
      else{
        result[i]+= temp[i];
      }
    }
    count++;
  }
}

void reverse(char a[])
{
  char temp[MAX_STR_SIZE];
  int x;
  x=strlen(a);
  for(int n=x-1;n>=0;n--)
  {
    temp[x-n-1]=a[n];
  }
  temp[x]='\0'; 
  strcpy(result,temp);
}

void ncarry(int n,int end){
  if(n==end){
    result[n+1]='1';
  }
  else{
    result[n+1]=result[n+1]+1;
  }
}

void whatbubblein(char a[],char b[])
{	int i,leng;
  leng = (int)(strlen(a));
  printf("bubble :\t");
  for (int i = 0; i <leng; ++i)
  {	
    printf("[%d]:%d(%c)  ",i, a[i],a[i]);
  } 
  printf("\nrebubble :\t");
  for(i= 0; i <leng;i++)
  {
    printf("[%d]:%d(%c)  ",i, b[i],b[i]);
  }
  printf("\n");

}