Due to the VIN is 17 ASCII chars, add a function to convert it to a char

[Joouis]

1. Due to : Mode 9 01 01 VIN message count 02 02 VIN (vehicle identification number) So fixed name of 0901 request first.
2. As the example given in datasheet, the input is: "31 44 34 47 50 30 30 52 35 35 42 31 32 33 34 35 36" And the output should be: "1 D 4 G P 0 0 R 5 5 B 1 2 3 4 5 6" So add the convert function to do this job.