fixing C/C++ CI errors

src/block_template.cpp

@@ -1246,10 +1246,6 @@ int BlockTemplate::create_miner_tx(const MinerData& data, const std::vector<Mine
         writeVarint(1, m_minerTx);
 
         // amount_burnt = 20% of total block reward
-        uint64_t miner_total = 0;
-        for (size_t i = 0; i < num_outputs; ++i) {
-                miner_total += m_rewards[i];
-        }
         uint64_t amount_burnt = full_block_reward / 5;
         writeVarint(amount_burnt, m_minerTx);
         m_poolBlockTemplate->m_amountBurnt = amount_burnt;

src/carrot_crypto.cpp

@@ -82,7 +82,7 @@ static void debug_hex(const char* label, const uint8_t* data, size_t len)
     static constexpr char log_category_prefix[] = "CarrotCrypto ";
     char hex[130] = {0};
     for (size_t i = 0; i < len && i < 64; ++i) {
-        sprintf(hex + i*2, "%02x", data[i]);
+        snprintf(hex + i*2, 3, "%02x", data[i]);
     }
     LOGINFO(6, label << ": " << static_cast<const char*>(hex));
 }

src/wallet.cpp

@@ -179,7 +179,7 @@ bool Wallet::decode(const char* address)
         }
 
         char hex_buf[32];
-        snprintf(hex_buf, sizeof(hex_buf), "0x%lx", tag);
+        snprintf(hex_buf, sizeof(hex_buf), "0x%llx", static_cast<unsigned long long>(tag));
 
         m_prefix = tag;
 
@@ -211,7 +211,7 @@ bool Wallet::decode(const char* address)
             for (int i = 0; i < std::min(data_index, 80); i++) {
                 sprintf(data_hex + i*2, "%02x", data[i]);
             }
-            sprintf(prefix_hex, "0x%lx", m_prefix);
+            sprintf(prefix_hex, "0x%llx", static_cast<unsigned long long>(m_prefix));
             LOGINFO(6, "decode varint_len=" << varint_len << " data_index=" << data_index << " prefix=" << static_cast<const char*>(prefix_hex));
             LOGINFO(6, "decode raw_data: " << static_cast<const char*>(data_hex));
             LOGINFO(6, "decode spend:    " << static_cast<const char*>(spend_hex));