Assignment on SML programming language

 Write a recursive ML function that uses pattern matching with name/type
 optconcat : char option list  -> string

that inputs a list of char options, and returns a single string consisting of all characters on the list concatenated together while ignoring any instances of NONE. For example,
     – optconcat([SOME #”b”,NONE,SOME #”o”,SOME #”o”,NONE]);
     val it = “boo” : string

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     – optconcat([NONE,NONE]);
     val it = “” : string
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