Bitcoin Elliptic Curve Generate Private Key in C Starter code

PrivateKey.c

//Full guide here:https://leetarxiv.substack.com/p/hacking-dormant-bitcoin-wallets-c
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <gmp.h>
#include <secp256k1.h>
#include <openssl/sha.h>
#include <openssl/ripemd.h>

//Run: clear && gcc PrivateKey.c -lsecp256k1 -lcrypto -lgmp -o m.o && ./m.o
typedef struct elliptic_curve_point_struct *EllipticCurvePoint;
struct elliptic_curve_point_struct
{
	mpz_t x;
	mpz_t y;
	int infinity;	
};

EllipticCurvePoint CreatePoint()
{
	EllipticCurvePoint point = malloc(sizeof(struct elliptic_curve_point_struct));
	mpz_init(point->x);
	mpz_init(point->y);
	point->infinity = 0;
	return point;
}

void CopyPoint(EllipticCurvePoint source, EllipticCurvePoint destination)
{
	mpz_set(destination->x, source->x);
	mpz_set(destination->y, source->y);
	destination->infinity = source->infinity;
}

int TestPointEquality(EllipticCurvePoint a, EllipticCurvePoint b)
{
	if(a->infinity && b->infinity) return 1;
	if(a->infinity || b->infinity) return 0;
	return mpz_cmp(a->x, b->x) == 0 && mpz_cmp(a->y, b->y) == 0;	
}

int TestLSBParity(mpz_t y)
{
	return mpz_tstbit(y, 0); // Returns 1 if odd, 0 if even
}

void DestroyPoint(EllipticCurvePoint point)
{
	if(point)
	{
		mpz_clear(point->x);
		mpz_clear(point->y);
		free(point);
	}
}

void TestECPoint()
{	
	//Curve properties
	char *primeNumberHexadecimal = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F";	
	char *generatorXHexadecimal  = "79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798";
	char *generatorYHexadecimal = "483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8";

	mpz_t primeNumber, privateKey;
	
	//Set prime number in base 16
	mpz_init_set_str(primeNumber, primeNumberHexadecimal, 16);
	//Set private key in base 10
	mpz_init_set_str(privateKey, "5", 10);
	
	//Create Generator and Result points
	EllipticCurvePoint generator = CreatePoint();
	EllipticCurvePoint resultant = CreatePoint();
	
	//Set generator X and Y values and infinity = 0
	mpz_set_str(generator->x, generatorXHexadecimal, 16);
	mpz_set_str(generator->y, generatorYHexadecimal, 16);
	generator->infinity = 0;
	
	DestroyPoint(generator);
	DestroyPoint(resultant);
	mpz_clears(primeNumber, privateKey,NULL);
}