Cloned form [https://github.com/tumdum/1brc]

• My rust solution got to 26s (10s just to read file), this one is much simpler and runs in 5seconds, amazing.
• One trick is the unsafe memmap of the 1brc file into ram, makes the reading much faster.

Added criterion benchmarking

• $ cargo bench
• View results under target/criterion/bench_1brc/report/index.html
•