5
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I have the following list:

l={"ALMONDBEAN", "ALMONDMILK", "ALMONDOLIVE_OIL", "ALMONDORANGE_PEEL", 
"ALMONDVANILLA", "ALMONDWHEAT", "ALMONDWHISKEY", "ANISECUCUMBER",
"ANISELEMON", "APPLEAPPLE_BRANDY", "APPLEBLACK_CURRANT",
"APPLECHERRY", "AVOCADOMILK"}

I want to modify it to have the following:

l={"Food.ALMOND.ALMONDBEAN", "Food.ALMOND.ALMONDMILK", "Food.ALMOND.ALMONDOLIVE_OIL", "Food.ALMOND.ALMONDORANGE_PEEL", 
    "Food.ALMOND.ALMONDVANILLA", "Food.ALMOND.ALMONDWHEAT", "Food.ALMOND.ALMONDWHISKEY", "Food.ANISE.ANISECUCUMBER",
    "Food.ANISE.ANISELEMON", "Food.APPLE.APPLEAPPLE_BRANDY", "Food.APPLE.APPLEBLACK_CURRANT",
    "Food.AVOCADO.APPLECHERRY", "Food.AVOCADO.AVOCADOMILK"}

Two things happen in this process: 1. "Food." shall be added to the beginning of each entry, 2. The first word of each entry shall be added to the middle. For example when we have "ALMONDBEAN" we want to get "ALMOND." and eventually have "Food.ALMOND.ALMONDBEAN"

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8
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ClearAll[reArrange]
reArrange[s_String] := ## & @@ StringCases[s, 
   StartOfString ~~ w__ ~~ rest__ ~~ EndOfString /; 
     (And @@ DictionaryWordQ /@ {w, ## & @@ StringSplit[rest, "_"]}) :> 
       StringRiffle[{"Food", w, s}, "."]]

reArrange /@ l

{"Food.ALMOND.ALMONDBEAN", "Food.ALMOND.ALMONDMILK", "Food.ALMOND.ALMONDOLIVE_OIL", "Food.ALMOND.ALMONDORANGE_PEEL", "Food.ALMOND.ALMONDVANILLA", "Food.ALMOND.ALMONDWHEAT", "Food.ALMOND.ALMONDWHISKEY", "Food.ANISE.ANISECUCUMBER", "Food.ANISE.ANISELEMON", "Food.APPLE.APPLEAPPLE_BRANDY", "Food.APPLE.APPLEBLACK_CURRANT", "Food.APPLE.APPLECHERRY", "Food.AVOCADO.AVOCADOMILK"}

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