use constants for True and False instead of tokens

ast/token.go

@@ -26,6 +26,9 @@ const (
     NUMBER    Token_t = iota
     SYMBOL    Token_t = iota
     BOOL      Token_t = iota
+
+    TRUE      string = "T"
+    FALSE     string = "F"
 )
 
 type Token struct {

ast/var_table.go

@@ -105,7 +105,7 @@ func InitVarTable(table VarTable) {
         }
 
         if variable[0] == "HOME" {
-            SetVar('~', t, table)
+            SetVar("~", t, table)
         }
         SetVar(variable[0], t, table)
     }