'Android - map a string to different value

I would like to map a string variable to different value! for example:

VAR := valid value is "user" or "userdebug"

VAR1 := VAR convert to "release" or "debug"
VAR2 := VAR convert to "Release" or "Debug"

I do not like if else, how can we do it just one line code?

android makefile

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