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The Go version, even without routines outperforms, by far, the Java version.
I tried to put every file to be parsed in one different Go routine. Maybe it is possible to put every line to be parsed in a different thread too.
The regex to find names of functions was the worst part. It's hard to build one regex the get all types of functions considering that every language has its grammar.
I sent the Java files too if interested. However, I did not use threads.
I commented the code. Any doubt please contact me: crispolitowski@gmail.com
PS.: I'd like to thanks for the opportunity. I was new with Go language, so I went from 0 knowledge to ... something during this challenge.