leet code replacement#5

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AndHager wants to merge 5 commits into

AndreasInfo:masterfrom

Commits on Oct 12, 2021

implemented leet converter
AndHager
committed
simplified if's and removed useless and unreachable lines
AndHager
committed
fixed typos
AndHager
committed
tested make leet
AndHager
committed
changed to list.extend(...) function
AndHager
committed