Nothing
GetStudentID = function(student_number){
str_split = unlist(strsplit(student_number, ""))
if(!is.element(str_split[1], c("a", "b", "A", "B"))){
message("Error in student id")
message("Your student id starts with an 'a' or a 'b'")
stop()
}
if(length(str_split) != 8){
cat("Error in student id\n")
cat("The length of your student id should be 8.\n")
stop()
}
return(paste(as.numeric(str_split[2:8]), collapse=""))
}
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