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Can someone help me complete my code? I am having trouble with it and I need some input.

```
//#include "bigint.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
/*
Create and implement
a bigint data structure that can represent integers whose size is limited
only by the memory capacity of your computer, the range of size_t and
sizeof(void*). There may be no other limits to the size of a bigint.
Your code must implement the following operations for a bigint. For
simplicity, we can assume that each bigint is nonnegative and we only
need to implement addition.
*/
struct bigint
{
int* data;
int initialzero;
int length;
};
typedef struct bigint bigint;
/*
bigint* bi_create(const char*);
Dynamically allocates a new bigint and returns a pointer to it. The
value of the bigint is read from the string given as a parameter, and
which can ce assumed to be a proper integer (which may be 0 and contain
initial zeros). For example, if intialized with the string "12345", the
bigint created would have the value 12345.
*/
bigint* bi_create(const char* charint)
{
int length = 0;
const char* temp;
int flag = 0;
temp = charint;
while(*charint != '\0')
{
length++;
charint++;
}
charint = temp;
// printf("LENGTH = %d \n", length);
bigint* bi = malloc(sizeof(bigint));
bi->data = malloc(length * sizeof(int));
bi->length = length;
int counter = 0;
int* datatemp;
bi->initialzero = 0;
datatemp = bi->data;
while(*charint != '\0')
{
if(*charint == '0' && flag != 1)
{
(bi->initialzero)++;
}else
{
flag = 1;
}
*bi->data = *charint - '0';
printf(" %d ", *bi->data);
charint++;
bi->data++;
counter++;
}
printf("\n");
bi->data = datatemp;
int counter1 = 0;
while(counter1 < bi->length)
{
printf("DATA = %d \n", *bi->data);
bi->data++;
counter1++;
}
// printf("INITIAL ZERO = %d \n", bi->initialzero);
return bi;
}
void bi_tostring(const bigint*, char*);
Writes the bigint into a string as text. You can assume that when
this function is called, the second parameter points to somewhere
that has enough space for the representation of the bigint.
void bi_tostring(const bigint* bigI, char* carint)
{
int *temp;
int templength = bigI->length;
temp = bigI->data;
while(templength>0)
{
*carint = *temp + '0';
printf(" TOSTRING %c", *carint);
temp++;
carint++;
templength--;
}
carint++;
*carint = '\0';
}
/*
bigint* bi_add(const bigint*, const bigint*);
Adds two bigints and dynamically allocates a new bigint for the
result, returning a pointer to the result. Doesn't modify the original
bigint values.
*/
bigint* bi_add(const bigint* BigI1, const bigint* BigI2)
{
int *temp1;
int *temp2;
int addition = 0;
int remainder = 0;
int counter1;
int counter2;
char *sum;
char *tempsum;
if(BigI1->length > BigI2->length)
{
sum = malloc((BigI1->length + 2)*sizeof(char));
counter1 = BigI1->length;
counter2 = BigI2->length;
temp1 = BigI1->data;
temp2 = BigI2->data;
temp1 = (temp1 + counter1-1);
temp2 = (temp2 + counter2-1);
}
else if(BigI1->length < BigI2->length)
{
sum = malloc((BigI2->length + 2)*sizeof(char));
counter1 = BigI2->length;
counter2 = BigI1->length;
temp1 = BigI2->data;
temp2 = BigI1->data;
temp1 = (temp1 + counter1-1);
temp2 = (temp2 + counter2-1);
}else
{
sum = malloc((BigI2->length + 2)*sizeof(char));
counter1 = BigI2->length;
counter2 = BigI1->length;
temp1 = BigI2->data;
temp2 = BigI1->data;
temp1 = (temp1 + counter1-1);
temp2 = (temp2 + counter2-1);
}
tempsum = sum;
printf("TEMPSUM: %d \n", tempsum);
sum = (sum + counter1+1);
*sum = '\0';
sum--;
addition = *temp2;
while(counter1 > 0)
{
printf("Counter: %d \n", counter1);
if((*temp1 + addition + remainder) > 9)
{
*sum = ((*temp1 + addition + remainder) - 10) + '0';
printf("TEMP1: %d \n", *temp1);
printf("TEMP2: %d \n", addition);
printf("SUM: %c \n", *sum);
remainder = 1;
}else
{
*sum = ((*temp1 + addition + remainder)) + '0';
remainder = 0;
printf("TEMP1: %d \n", *temp1);
printf("TEMP2: %d \n", addition);
printf("SUM: %c \n", *sum);
}
temp1--;
if(counter2 >1)
{
printf("Counter: %d \n", counter2);
temp2--;
addition = *temp2;
}else
{
addition = 0;
}
counter1--;
counter2--;
sum--;
}
sum = tempsum;
if(remainder == 1)
{
*sum = 1 + '0';
}else
{
*sum =0 + '0';
}
printf("ENDING \n");
return bi_create(sum);
}
/*
int bi_compare(const bigint*, const bigint*);
Order-compares the two bigints. If first bigint is less than the
second, returns -1. If they are equal, returns 0. If the first bigint
is greater than the second, returns +1.
*/
int bi_compare(const bigint* BigI1, const bigint* BigI2)
{
int *temp1;
int *temp2;
}
/*
void bi_release(bigint*);
Releases all memory that has been internally allocated for the given
bigint. After this call, the users are assumed not to use that bigint
object any more ever again.
*/
void bi_release(bigint* BigI)
{
free(BigI->data);
free(BigI);
}
```