Add check if end after begin for removing spaces

inkcpp/output.cpp

@@ -140,8 +140,12 @@ namespace ink::runtime::internal
 		std::string result = str.str();
 		if ( !result.empty() ) {
 			auto end = clean_string<true, false>( result.begin(), result.end() );
-			_last_char = *( end - 1 );
-			result.resize( end - result.begin() - ( _last_char == ' ' ? 1 : 0 ) );
+			if (result.begin() == end) {
+				result.resize(0);
+			} else {
+				_last_char = *( end - 1 );
+				result.resize( end - result.begin() - ( _last_char == ' ' ? 1 : 0 ) );
+			}
 		}
 		return result;
 	}

inkcpp/runner_impl.cpp

@@ -185,7 +185,7 @@ namespace ink::runtime::internal
 
 		const uint32_t* iter = nullptr;
 		container_t id;
-		ip_t offset;
+		ip_t offset = nullptr;
 		size_t comm_end;
 		bool reversed = _ptr > dest;