Fixed unescaped-literal missing character. (#99)

* Fixed `unescaped-literal` missing character.

* JSON empty strings are valid.

* Fix json-quoted-string character repitition

Co-authored-by: Nolan Woods <[email protected]>

Author: springcomp

GRAMMAR.ABNF

@@ -569,7 +569,7 @@ unescaped-literal = %x20-21 /   ; space !
 										%x23-5B /   ; # - [
 										%x5D-5F /   ; ] ^ _
 										%x61-7A /   ; a-z
-										%x7C-10FFFF ; |}~ ...
+										%x7B-10FFFF ; {|}~ ...
 escaped-literal   = escaped-char / (escape "`")
 number            = ["-"] 1*digit
 digit             = %x30-39
@@ -625,7 +625,7 @@ json-value = false / null / true / json-object / json-array /
 false = %x66.61.6c.73.65   ; false
 null  = %x6e.75.6c.6c      ; null
 true  = %x74.72.75.65      ; true
-json-quoted-string = %x22 1*(unescaped-literal / escaped-literal) %x22
+json-quoted-string = %x22 *( unescaped-literal / escaped-literal ) %x22
 begin-array     = ws %x5B ws  ; [ left square bracket
 begin-object    = ws %x7B ws  ; { left curly bracket
 end-array       = ws %x5D ws  ; ] right square bracket