fix: clean up a few warnings

fallout.go

@@ -53,7 +53,7 @@ func main() {
 		}
 
 		if len(game.Words) == 1 {
-			for word, _ := range game.Words {
+			for word := range game.Words {
 				fmt.Printf("The word is: %s\n", word)
 				os.Exit(0)
 			}
@@ -140,7 +140,7 @@ func (g Game) scoreWordsByCommonLetterLocations() error {
 		lastWord = word.Word
 	}
 
-	for idx, _ := range lastWord {
+	for idx := range lastWord {
 		letterIdxScores[idx] = make(map[string]int)
 	}