adjust the prototype of 'user_callback_char_fn_t()' function,in order to easy add command and user no need to parse the command string manually #15
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user can add new command as "my_function()", their input will auto parsed ,and it support max 5 parammeters ,each no longer than 10,as below example:
`
#define MAX_CMD_ARGC_NUM (5) #define MAX_CMD_ARGV_STR_LENGTH (10 + 1)