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Evidently, extract_car_code must take an argument that is a pointer
to a character array, and it must return a character. Hence, the
definition of extract_car_code must declare a character-pointer
argument and a character return value:
char extract_car_code (char *input_buffer) {...}
The body, of course, just needs to pick out the fourth element—the one carrying the car-type information:
char extract_car_code (char *input_buffer) {
return input_buffer[4];
}