MIN_CHANGE is a privacy leak, since it is an easily observable wallet behaviour. Any output almost equal, but minimally larger than MIN_CHANGE is highly likely the change output of a tx.

Also, MIN_CHANGE is quite high, considering the value of bitcoin.

An easy fix for the second issue would be to just lower the value, but maybe some randomization can be done to also fix the first issue?
#ifndef BITCOIN_WALLET_COINSELECTION_H
#define BITCOIN_WALLET_COINSELECTION_H
#include <consensus/amount.h>
#include <policy/feerate.h>
#include <primitives/transaction.h>
#include <random.h>
#include <optional>
namespace wallet {
static constexpr CAmount MIN_CHANGE{COIN / 100};
static const CAmount MIN_FINAL_CHANGE = MIN_CHANGE/2;
struct COutput {
    
    COutPoint outpoint;