feat: reducer, but doesn`t work

pkg/tokenizer/token.go

@@ -5,13 +5,13 @@ type TokenType int
 const (
 	TokenOpenParen TokenType = iota
 	TokenCloseParen
-	TokenAtom
+	TokenVariable
 	TokenSlash
 	TokenDot
 )
 
 type Token struct {
 	Index int
-	Type TokenType
+	Type  TokenType
 	Value string
 }