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[na_th_an]

You can do it.

A FSM is a Finite State Machine. Once the FSM is hardcoded (in an array, for example) a FSM interpreter can be done in 10 lines of code. You just have to check for the state where you are and the symbol coming (one at a time) and jumping to a new state depending on it.

Note that I said that the FSM interpreter will take 10 lines of code. Of couse you need more lines to check if the input file exists, opening files, and doing misc stuff.