Factor the monero donation address

Signed-off-by: Maxithi <34792056+Maxithi@users.noreply.github.com>

src/simplewallet/simplewallet.cpp

@@ -4534,8 +4534,6 @@ bool simple_wallet::donate(const std::vector<std::string> &args_)
      fail_msg_writer() << tr("usage: donate [index=<N1>[,<N2>,...]] [<priority>] [<ring_size>] <amount> [<payment_id>]");
      return true;
   }
-  // Hardcode Monero's donation address (see #1447)
-  const std::string address_str = "44AFFq5kSiGBoZ4NMDwYtN18obc8AemS33DBLWs3H7otXft3XjrpDtQGv7SqSsaBYBb98uNbr2VBBEt7f2wfn3RVGQBEP3A";
   std::string amount_str;
   std::string payment_id_str;
   // get payment id and pop
@@ -4551,11 +4549,11 @@ bool simple_wallet::donate(const std::vector<std::string> &args_)
   amount_str = local_args.back();
   local_args.pop_back();
   // push back address, amount, payment id
-  local_args.push_back(address_str);
+  local_args.push_back(MONERO_DONATION_ADDR);
   local_args.push_back(amount_str);
   if (!payment_id_str.empty())
     local_args.push_back(payment_id_str);
-  message_writer() << tr("Donating ") << amount_str << " to The Monero Project (donate.getmonero.org/44AFFq5kSiGBoZ4NMDwYtN18obc8AemS33DBLWs3H7otXft3XjrpDtQGv7SqSsaBYBb98uNbr2VBBEt7f2wfn3RVGQBEP3A).";
+  message_writer() << tr("Donating ") << amount_str << " to The Monero Project (donate.getmonero.org/"<< MONERO_DONATION_ADDR <<").";
   transfer_new(local_args);
   return true;
 }

src/simplewallet/simplewallet.h

@@ -49,6 +49,8 @@
 
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "wallet.simplewallet"
+// Hardcode Monero's donation address (see #1447)
+constexpr const char MONERO_DONATION_ADDR[] = "44AFFq5kSiGBoZ4NMDwYtN18obc8AemS33DBLWs3H7otXft3XjrpDtQGv7SqSsaBYBb98uNbr2VBBEt7f2wfn3RVGQBEP3A";
 
 /*!
  * \namespace cryptonote

tests/unit_tests/address_from_url.cpp

@@ -32,6 +32,7 @@
 
 #include "wallet/wallet2.h"
 #include "common/dns_utils.h"
+#include "simplewallet/simplewallet.h"
 #include <string>
 
 TEST(AddressFromTXT, Success)
@@ -83,7 +84,7 @@ TEST(AddressFromTXT, Failure)
 
 TEST(AddressFromURL, Success)
 {
-  const std::string addr = "44AFFq5kSiGBoZ4NMDwYtN18obc8AemS33DBLWs3H7otXft3XjrpDtQGv7SqSsaBYBb98uNbr2VBBEt7f2wfn3RVGQBEP3A";
+  const std::string addr = MONERO_DONATION_ADDR;
   
   bool dnssec_result = false;