The first char appears because your terminal is echoing back what you are typing in. This is the default, and you see it also in most other programs, with password inputs as a big exception. Those tell the terminal in some way that it should disable the echo functionality, and turn it back on after the password has been read. see https://stackoverflow.com/questions/59922972/how-to-stop-echo-in-terminal-using-c for more info
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