brainfuck

My first Rust project : brainfuck interpreter，comprehensive and easy to read

Usage

$ ./brainfuck --help
Usage:

[code]               Use an argument as the code
-f [path]            Read code from a file
--REPL | --repl      Start in REPL mode
--bulk               Bulk output mode
--cell [u8|u16|u32]  Set the cell size
-v | --verbose       Display verbose information
--IR                 Display intermediate representation of the code
[input]              Input can be a string ending with 'u32' to be parsed as uint32

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