addHexPrefix.c

#include <stdlib.h>
#include<string.h>
#include "main.h"

/**
 * add0xPrefixToHex - Adds "0x" prefix to a given hexadecimal string.
 *
 * @hexString: The input hexadecimal string to which the "0x" prefix will be added.
 *
 * Description:
 *   This function takes an input hexadecimal string and returns a new string with "0x" added as a
 *   prefix to the original string. The resulting string is null-terminated. The function allocates
 *   memory for the new string and ensures it can accommodate the original string, "0x" prefix, and
 *   a null terminator.
 *
 * Return: A dynamically allocated string containing the original hexadecimal string with the "0x"
 *         prefix added, or NULL if the input string is NULL or on memory allocation failure.
 */
char* add0xPrefixToHex(const char* hexString)
{
    size_t inputLength;
    size_t newLength;
    char* result;

    if (hexString == NULL) {
        return (NULL);
    }

    inputLength = strlen(hexString);
    newLength = inputLength + 2;

    result = (char*)malloc(newLength + 1);

    if (result == NULL)
    {
        return (NULL);
    }

    strcpy(result, "0x");
    strcat(result, hexString);

    return (result);
}