All issues

[Samiul946]

1. Critical Logic Failure in Base Conversion
   The program is fundamentally broken. It does not correctly convert the input number from its source base to base 10. The code in main and the stringToBigNumber function incorrectly assume the input string is always a base-10 number, rendering the from argument useless. The program will only work if the source base is actually 10.

2. Buggy stringToBigNumber Function
   The stringToBigNumber function fails to parse numbers from any base other than 10. It uses string[i] - '0' to convert characters to integers, which only works for the characters '0' through '9'. It completely ignores the convertCharToInt helper function, so it cannot handle digits like 'A' (for hexadecimal) or any other letter-based digit.

3. Integer Overflow in BigNumberGetNumber
   The BigNumberGetNumber function converts a BigNumber back into a standard int. This defeats the entire purpose of the BigNumber library. If the number is too large to fit in an int, this function will overflow and return a meaningless value. This critical bug corrupts the result of the convertBase10ToN function, which relies on it.

4. Significant Memory Leaks
   The convertBase10ToN function leaks memory inside its while loop. In each iteration, it allocates a new BigNumber for the result of the division (BigNumberDiv) and assigns it to the temp pointer, but it never frees the memory pointed to by the old temp. This leads to a memory leak that grows with the size of the input number.

5. Inefficient and Inaccurate Use of pow()
   The BigNumberGetNumber function uses pow(), which is a floating-point math function, for integer arithmetic. This is highly inefficient and can introduce precision errors for large numbers, leading to incorrect calculations.

6. Inconsistent Character Conversion
   The character-to-integer conversion functions are mismatched:

convertCharToInt supports bases up to 36 ('0'-'9', 'A'-'Z').

convertIntToChar supports bases up to 62 ('0'-'9', 'a'-'z', 'A'-'Z').

This means the program could generate output (e.g., in base 40) that it cannot correctly read back as input.