Attempt to fix #646

https://github.com/probonopd/MiniDexed/issues/648

src/minidexed.cpp

@@ -1763,13 +1763,20 @@ bool CMiniDexed::IsValidPerformanceBank(unsigned nBankID)
 	return m_PerformanceConfig.IsValidPerformanceBank(nBankID);
 }
 
-void CMiniDexed::SetVoiceName (std::string VoiceName, unsigned nTG)
+void CMiniDexed::SetVoiceName(std::string VoiceName, unsigned nTG)
 {
-	assert (nTG < CConfig::ToneGenerators);
-	assert (m_pTG[nTG]);
-	char Name[10];
-	strncpy(Name, VoiceName.c_str(),10);
-	m_pTG[nTG]->getName (Name);
+	assert(nTG < CConfig::ToneGenerators);
+	assert(m_pTG[nTG]);
+
+	// Define a buffer with enough space for the string and null terminator
+	char Name[VoiceName.size() + 1];
+
+	// Copy the string and ensure null termination
+	strncpy(Name, VoiceName.c_str(), VoiceName.size());
+	Name[VoiceName.size()] = '\0';
+
+	// Pass the null-terminated string to getName
+	m_pTG[nTG]->getName(Name);
 }
 
 bool CMiniDexed::DeletePerformance(unsigned nID)