Add iotd program framework source code

guowenxue

2021-04-20 c7b6f4f68a6c9e8e83849601bd0f5240c47c317f

 modules/c/ds18b20.c

@@ -32,7 +32,7 @@
                return 1;
        }

        printf("DS19B20 get temperature: %f ℃\n", temp);
        printf("DS18B20 get temperature: %f ℃\n", temp);
        return 0;
}