factorial does not work, error line 5

```
:F
  "           // Duplicate n
  1 >         // Check if n > 1
  (           // If true
    " 1 - F * // n * factorial(n - 1)     <<<<<<<<<<<<<< error, never gets to do `*`
  ) /E (      // Else condition wrapped in parentheses
    1         // Return 1
  )
;
5 F .         // Calculate factorial of 5, prints: 120

```
