diff --git a/#gui.rkt#1# b/#gui.rkt#1#
deleted file mode 100644
index bfb605e..0000000
--- a/#gui.rkt#1#
+++ /dev/null
@@ -1,1182 +0,0 @@
-#reader(lib"read.ss""wxme")WXME0108 ## 
-#|
-   This file uses the GRacket editor format.
-   Open this file in DrRacket version 7.0 or later to read it.
-
-   Most likely, it was created by saving a program in DrRacket,
-   and it probably contains a program with non-text elements
-   (such as images or comment boxes).
-
-            http://racket-lang.org/
-|#
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-0 0 17 3 12 #"; - 'comment"
-0 0 24 29 1 #"\n"
-0 0 17 3 16 #"; - 'instruction"
-0 0 24 29 1 #"\n"
-0 0 17 3 10 #"; - 'shift"
-0 0 24 29 1 #"\n"
-0 0 17 3 9 #"; - 'loop"
-0 0 24 29 1 #"\n"
-0 0 17 3 40 #"; Interp: category of a bf program token"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 22 #"; A BFStyle is one of:"
-0 0 24 29 1 #"\n"
-0 0 17 3 13 #"; - \"Comment\""
-0 0 24 29 1 #"\n"
-0 0 17 3 17 #"; - \"Instruction\""
-0 0 24 29 1 #"\n"
-0 0 17 3 11 #"; - \"Shift\""
-0 0 24 29 1 #"\n"
-0 0 17 3 10 #"; - \"Loop\""
-0 0 24 29 1 #"\n"
-0 0 17 3 50 #"; Interp: name of the style for a bf program token"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 40 #"; bf-token->bf-style: BFToken -> BFStyle"
-0 0 24 29 1 #"\n"
-0 0 17 3 53 #"; Given a BFToken, returns the corresponding BFStyle."
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 2 #" ("
-0 0 14 3 18 #"bf-token->bf-style"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"token"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 9 #"        ("
-0 0 15 3 4 #"cond"
-0 0 24 3 3 #" [("
-0 0 14 3 8 #"symbol=?"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"token"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 7 #"comment"
-0 0 24 3 2 #") "
-0 0 19 3 9 #"\"Comment\""
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 16 #"              [("
-0 0 14 3 8 #"symbol=?"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"token"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 4 #"loop"
-0 0 24 3 2 #") "
-0 0 19 3 6 #"\"Loop\""
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 16 #"              [("
-0 0 14 3 8 #"symbol=?"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"token"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 5 #"shift"
-0 0 24 3 2 #") "
-0 0 19 3 7 #"\"Shift\""
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 16 #"              [("
-0 0 14 3 8 #"symbol=?"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"token"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 11 #"instruction"
-0 0 24 3 2 #") "
-0 0 19 3 13 #"\"Instruction\""
-0 0 24 3 3 #"]))"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 77
-(
- #"; bf-lexer: InputPort -> (values 1String BFToken #f Option<Nat> Opti"
- #"on<Nat>) "
-) 0 0 24 29 1 #"\n"
-0 0 17 3 76
-(
- #"; Given an input port, returns the BFToken of the instruction pointe"
- #"d by the"
-) 0 0 24 29 1 #"\n"
-0 0 17 3 7 #"; port."
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 2 #" ("
-0 0 14 3 8 #"bf-lexer"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"port"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 3 #"  ("
-0 0 15 3 13 #"define-values"
-0 0 24 3 2 #" ("
-0 0 14 3 1 #"_"
-0 0 24 3 1 #" "
-0 0 14 3 2 #"__"
-0 0 24 3 1 #" "
-0 0 14 3 3 #"pos"
-0 0 24 3 3 #") ("
-0 0 14 3 18 #"port-next-location"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"port"
-0 0 24 3 2 #"))"
-0 0 24 29 1 #"\n"
-0 0 24 3 3 #"  ("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"c"
-0 0 24 3 2 #" ("
-0 0 14 3 9 #"read-char"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"port"
-0 0 24 3 2 #"))"
-0 0 24 29 1 #"\n"
-0 0 24 3 3 #"  ("
-0 0 15 3 4 #"cond"
-0 0 24 3 3 #" [("
-0 0 14 3 11 #"eof-object?"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"c"
-0 0 24 3 3 #") ("
-0 0 14 3 6 #"values"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"c"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 3 #"eof"
-0 0 24 3 1 #" "
-0 0 21 3 2 #"#f"
-0 0 24 3 1 #" "
-0 0 21 3 2 #"#f"
-0 0 24 3 1 #" "
-0 0 21 3 2 #"#f"
-0 0 24 3 2 #")]"
-0 0 24 29 1 #"\n"
-0 0 24 3 9 #"        ["
-0 0 14 3 4 #"else"
-0 0 24 29 1 #"\n"
-0 0 24 3 10 #"         ("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"1str"
-0 0 24 3 2 #" ("
-0 0 14 3 6 #"string"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"c"
-0 0 24 3 2 #"))"
-0 0 24 29 1 #"\n"
-0 0 24 3 10 #"         ("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 8 #"bf-token"
-0 0 24 29 1 #"\n"
-0 0 24 3 12 #"           ("
-0 0 15 3 4 #"cond"
-0 0 24 3 3 #" [("
-0 0 14 3 11 #"set-member?"
-0 0 24 3 2 #" ("
-0 0 14 3 3 #"set"
-0 0 24 3 1 #" "
-0 0 19 3 3 #"\"+\""
-0 0 24 3 1 #" "
-0 0 19 3 3 #"\"-\""
-0 0 24 3 1 #" "
-0 0 19 3 3 #"\",\""
-0 0 24 3 1 #" "
-0 0 19 3 3 #"\".\""
-0 0 24 3 2 #") "
-0 0 14 3 4 #"1str"
-0 0 24 3 2 #") "
-0 0 21 3 1 #"'"
-0 0 14 3 11 #"instruction"
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 19 #"                 [("
-0 0 14 3 11 #"set-member?"
-0 0 24 3 2 #" ("
-0 0 14 3 3 #"set"
-0 0 24 3 1 #" "
-0 0 19 3 3 #"\"<\""
-0 0 24 3 1 #" "
-0 0 19 3 3 #"\">\""
-0 0 24 3 2 #") "
-0 0 14 3 4 #"1str"
-0 0 24 3 2 #") "
-0 0 21 3 1 #"'"
-0 0 14 3 5 #"shift"
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 19 #"                 [("
-0 0 14 3 11 #"set-member?"
-0 0 24 3 2 #" ("
-0 0 14 3 3 #"set"
-0 0 24 3 1 #" "
-0 0 19 3 3 #"\"[\""
-0 0 24 3 1 #" "
-0 0 19 3 3 #"\"]\""
-0 0 24 3 2 #") "
-0 0 14 3 4 #"1str"
-0 0 24 3 2 #") "
-0 0 21 3 1 #"'"
-0 0 14 3 4 #"loop"
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 18 #"                 ["
-0 0 14 3 4 #"else"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 7 #"comment"
-0 0 24 3 3 #"]))"
-0 0 24 29 1 #"\n"
-0 0 24 3 10 #"         ("
-0 0 14 3 6 #"values"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"1str"
-0 0 24 3 1 #" "
-0 0 14 3 8 #"bf-token"
-0 0 24 3 1 #" "
-0 0 21 3 2 #"#f"
-0 0 24 3 2 #" ("
-0 0 14 3 1 #"+"
-0 0 24 3 1 #" "
-0 0 14 3 3 #"pos"
-0 0 24 3 3 #") ("
-0 0 14 3 1 #"+"
-0 0 24 3 1 #" "
-0 0 14 3 3 #"pos"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"1"
-0 0 24 3 5 #"))]))"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 35 #"; Syntax highlighting for brainf*ck"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"editor"
-0 0 24 3 1 #" "
-0 0 14 3 13 #"start-colorer"
-0 0 24 3 1 #" "
-0 0 14 3 18 #"bf-token->bf-style"
-0 0 24 3 1 #" "
-0 0 14 3 8 #"bf-lexer"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 24 3 3 #"())"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 47 #"; Define basic style for instructions (+ - , .)"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 2 #" ("
-0 0 15 3 11 #"make-object"
-0 0 24 3 1 #" "
-0 0 14 3 12 #"style-delta%"
-0 0 24 3 2 #"))"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 1 #" "
-0 0 14 3 20 #"set-delta-foreground"
-0 0 24 3 1 #" "
-0 0 19 3 6 #"\"blue\""
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 36 #"editor:set-standard-style-list-delta"
-0 0 24 3 1 #" "
-0 0 19 3 13 #"\"Instruction\""
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 44 #"; Define style for shifting operations (< >)"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 1 #" "
-0 0 14 3 20 #"set-delta-foreground"
-0 0 24 3 1 #" "
-0 0 19 3 5 #"\"red\""
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 36 #"editor:set-standard-style-list-delta"
-0 0 24 3 1 #" "
-0 0 19 3 7 #"\"Shift\""
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 51 #"; Define basic style for looping instructions ([ ])"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 1 #" "
-0 0 14 3 20 #"set-delta-foreground"
-0 0 24 3 1 #" "
-0 0 19 3 13 #"\"forestgreen\""
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 36 #"editor:set-standard-style-list-delta"
-0 0 24 3 1 #" "
-0 0 19 3 6 #"\"Loop\""
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 26 #"; Define style of comments"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 1 #" "
-0 0 14 3 20 #"set-delta-foreground"
-0 0 24 3 1 #" "
-0 0 19 3 8 #"\"orange\""
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 36 #"editor:set-standard-style-list-delta"
-0 0 24 3 1 #" "
-0 0 19 3 9 #"\"Comment\""
-0 0 24 3 1 #" "
-0 0 14 3 5 #"delta"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 22 #"; Running output color"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 7 #"run-col"
-0 0 24 3 2 #" ("
-0 0 15 3 11 #"make-object"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"color%"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"250"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"250"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"200"
-0 0 24 3 2 #"))"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 24 #"; Output completed color"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 7 #"end-col"
-0 0 24 3 2 #" ("
-0 0 15 3 11 #"make-object"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"color%"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"200"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"250"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"200"
-0 0 24 3 2 #"))"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 2 #"mb"
-0 0 24 3 2 #" ("
-0 0 14 3 3 #"new"
-0 0 24 3 1 #" "
-0 0 14 3 9 #"menu-bar%"
-0 0 24 3 2 #" ["
-0 0 14 3 6 #"parent"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"f"
-0 0 24 3 3 #"]))"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"m-file"
-0 0 24 3 2 #" ("
-0 0 14 3 3 #"new"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"menu%"
-0 0 24 3 2 #" ["
-0 0 14 3 5 #"label"
-0 0 24 3 1 #" "
-0 0 19 3 6 #"\"File\""
-0 0 24 3 3 #"] ["
-0 0 14 3 6 #"parent"
-0 0 24 3 1 #" "
-0 0 14 3 2 #"mb"
-0 0 24 3 3 #"]))"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"m-edit"
-0 0 24 3 2 #" ("
-0 0 14 3 3 #"new"
-0 0 24 3 1 #" "
-0 0 14 3 5 #"menu%"
-0 0 24 3 2 #" ["
-0 0 14 3 5 #"label"
-0 0 24 3 1 #" "
-0 0 19 3 6 #"\"Edit\""
-0 0 24 3 3 #"] ["
-0 0 14 3 6 #"parent"
-0 0 24 3 1 #" "
-0 0 14 3 2 #"mb"
-0 0 24 3 3 #"]))"
-0 0 24 29 1 #"\n"
-0 0 24 29 1 #"\n"
-0 0 17 3 28 #"; The run output text object"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 10 #"run-output"
-0 0 24 3 2 #" ("
-0 0 14 3 3 #"new"
-0 0 24 3 1 #" "
-0 0 14 3 11 #"text-field%"
-0 0 24 29 1 #"\n"
-0 0 24 3 25 #"                        ["
-0 0 14 3 5 #"style"
-0 0 24 3 2 #" ("
-0 0 14 3 4 #"list"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 8 #"multiple"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 14 #"vertical-label"
-0 0 24 3 2 #")]"
-0 0 24 29 1 #"\n"
-0 0 24 3 25 #"                        ["
-0 0 14 3 5 #"label"
-0 0 24 3 1 #" "
-0 0 19 3 19 #"\"Execution output:\""
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 25 #"                        ["
-0 0 14 3 6 #"parent"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"f"
-0 0 24 3 3 #"]))"
-0 0 24 29 1 #"\n"
-0 0 24 3 2 #"  "
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 7 #"mi-open"
-0 0 24 29 1 #"\n"
-0 0 24 3 3 #"  ("
-0 0 14 3 3 #"new"
-0 0 24 3 1 #" "
-0 0 14 3 10 #"menu-item%"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 5 #"label"
-0 0 24 3 1 #" "
-0 0 19 3 6 #"\"Open\""
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 6 #"parent"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"m-file"
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 8 #"callback"
-0 0 24 29 1 #"\n"
-0 0 24 3 9 #"        ("
-0 0 15 3 6 #"lambda"
-0 0 24 3 2 #" ("
-0 0 14 3 1 #"i"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"e"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 11 #"          ("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"path"
-0 0 24 3 2 #" ("
-0 0 14 3 8 #"get-file"
-0 0 24 3 1 #" "
-0 0 21 3 2 #"#f"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"f"
-0 0 24 3 2 #"))"
-0 0 24 29 1 #"\n"
-0 0 24 3 11 #"          ("
-0 0 15 3 4 #"when"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"path"
-0 0 24 29 1 #"\n"
-0 0 24 3 13 #"            ("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"editor"
-0 0 24 3 1 #" "
-0 0 14 3 9 #"load-file"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"path"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 4 #"text"
-0 0 24 3 4 #")))]"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 8 #"shortcut"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"#\\o"
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 15 #"shortcut-prefix"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 24 3 1 #"("
-0 0 14 3 3 #"ctl"
-0 0 24 3 4 #")]))"
-0 0 24 29 1 #"\n"
-0 0 24 3 2 #"  "
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 15 3 6 #"define"
-0 0 24 3 1 #" "
-0 0 14 3 7 #"mi-save"
-0 0 24 29 1 #"\n"
-0 0 24 3 3 #"  ("
-0 0 14 3 3 #"new"
-0 0 24 3 1 #" "
-0 0 14 3 10 #"menu-item%"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 5 #"label"
-0 0 24 3 1 #" "
-0 0 19 3 6 #"\"Save\""
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 6 #"parent"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"m-file"
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 8 #"callback"
-0 0 24 29 1 #"\n"
-0 0 24 3 9 #"        ("
-0 0 15 3 6 #"lambda"
-0 0 24 3 2 #" ("
-0 0 14 3 1 #"i"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"e"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 11 #"          ("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"editor"
-0 0 24 3 1 #" "
-0 0 14 3 9 #"save-file"
-0 0 24 3 1 #" "
-0 0 21 3 2 #"#f"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 14 3 4 #"text"
-0 0 24 3 3 #"))]"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 8 #"shortcut"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"#\\s"
-0 0 24 3 1 #"]"
-0 0 24 29 1 #"\n"
-0 0 24 3 8 #"       ["
-0 0 14 3 15 #"shortcut-prefix"
-0 0 24 3 1 #" "
-0 0 21 3 1 #"'"
-0 0 24 3 1 #"("
-0 0 14 3 3 #"ctl"
-0 0 24 3 4 #")]))"
-0 0 24 29 1 #"\n"
-0 0 24 3 2 #"  "
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 34 #"append-editor-operation-menu-items"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"m-edit"
-0 0 24 3 1 #" "
-0 0 21 3 2 #"#f"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"editor"
-0 0 24 3 1 #" "
-0 0 14 3 20 #"set-max-undo-history"
-0 0 24 3 1 #" "
-0 0 21 3 3 #"100"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"c"
-0 0 24 3 1 #" "
-0 0 14 3 10 #"set-editor"
-0 0 24 3 1 #" "
-0 0 14 3 6 #"editor"
-0 0 24 3 1 #")"
-0 0 24 29 1 #"\n"
-0 0 24 3 1 #"("
-0 0 14 3 4 #"send"
-0 0 24 3 1 #" "
-0 0 14 3 1 #"f"
-0 0 24 3 1 #" "
-0 0 14 3 4 #"show"
-0 0 24 3 1 #" "
-0 0 21 3 2 #"#t"
-0 0 24 3 1 #")"
-0           0
diff --git a/gui.rkt b/gui.rkt
index a4176a3..7bb6565 100644
--- a/gui.rkt
+++ b/gui.rkt
@@ -14,13 +14,15 @@
                [width EDITOR-WIDTH]
                [height EDITOR-HEIGHT]))
 
-; execute-content: () -> ProgState
-; Returns the last state of execution of the program loaded in the editor
-(define (execute-content)
+; execute-content: ((ProgState) -> Any) -> ProgState
+; Given a callback, calls the callback with the last state of execution of the
+; program loaded in the editor
+(define (execute-content done)
   (execute
    (program->prog-state
     (string->program
-     (send editor get-flattened-text)))))
+     (send editor get-flattened-text)))
+   done (lambda (callback) (callback 50))))
 
 ; run-program: Button ControlEvent -> Nothing
 ; Given a button and an event, runs the program currently loaded in the editor.
@@ -30,11 +32,13 @@
   (send run-output set-field-background run-col)
 
   ; run the program
-  (define out (prog-state-output (execute-content)))
-
-  ; set output and change color to ended
-  (send run-output set-value out)
-  (send run-output set-field-background end-col))
+  (execute-content
+   (lambda (ps)
+     (define out (prog-state-output ps))
+     
+     ; set output and change color to ended
+     (send run-output set-value out)
+     (send run-output set-field-background end-col))))
 
 ; Definition of the run button widget
 (define run-btn (new button% [parent f]
diff --git a/interpreter.rkt b/interpreter.rkt
index ec9e5c6..d405fd9 100644
--- a/interpreter.rkt
+++ b/interpreter.rkt
@@ -222,16 +222,6 @@
 (check-expect (exec-out (prog-state (list 65) 0 1 "" ".[->+<]" 0))
               (prog-state (list 65) 0 1 "A" ".[->+<]" 1))
 
-; char-at: String Nat -> 1String
-; Given a string and an index, returns the 1String at the position pointed by
-; index
-(define (char-at s i)
-  (substring s i (add1 i)))
-
-; Tests for char-at
-(check-expect (char-at "malusa" 2) "l")
-(check-error (char-at "another string" 300))
-
 ; WalkingDirection can be one of:
 ; - 'forward
 ; - 'backward
@@ -317,6 +307,11 @@
                (prog-state '(1) 0 1 "" "[++--]++--+-[]" 5))
               (prog-state '(1) 0 1 "" "[++--]++--+-[]" 1))
 
+; insert-in-tape: DataTape Byte Nat -> DataTape
+(define (insert-in-tape dt val n)
+  (cond [(zero? n) (cons val (rest dt))]
+        [else (cons (first dt) (insert-in-tape (rest dt) val (sub1 n)))]))
+
 ; exec-in: ProgState ((Byte -> _) -> _) (ProgState -> _) -> _
 ; Given a ProgState, a function that takes a callback function requiring a Byte
 ; and a function which takes the new ProgState, calls done with the input
@@ -325,7 +320,7 @@
 (define (exec-in w get-input done)
   (define (got-input byte)
     (done (prog-state
-           (insert-in-tape byte (prog-state-dp w))
+           (insert-in-tape (prog-state-tape w) byte (prog-state-dp w))
            (prog-state-dp w)
            (prog-state-tape-len w)
            (prog-state-output w)
@@ -333,23 +328,23 @@
            (add1 (prog-state-ip w)))))
   (get-input got-input))
 
-; execute: ProgState ((ProgState) -> _) -> ProgState
+; execute: ProgState ((ProgState) -> _) ((Byte -> _) -> _) -> ProgState
 ; Given an initial ProgState state, calls done when the final ProgState is ready
 ; to execute the program.
-(define (execute w done)
-  (local [(define program-len (string-length (prog-state-program w)))]
-    (cond [(>= (prog-state-ip w) program-len) (done w)]
-          [else
-           (define inst (char-at (prog-state-program w) (prog-state-ip w)))
-           (cond [(string=? inst ",") (exec-in w (lambd]
-                 [else
-                  (execute (cond [(string=? inst "+") (exec-add1 w)]
-                                 [(string=? inst "-") (exec-sub1 w)]
-                                 [(string=? inst "<") (exec-tape-left w)]
-                                 [(string=? inst ">") (exec-tape-right w)]
-                                 [(string=? inst "[") (exec-loop-start w)]
-                                 [(string=? inst "]") (exec-loop-end w)]
-                                 [(string=? inst ".") (exec-out w)]) done)])])))
+(define (execute w done get-input)
+  (define program-len (string-length (prog-state-program w)))
+  (cond [(>= (prog-state-ip w) program-len) (done w)]
+        [else
+         (define inst (string-ref (prog-state-program w) (prog-state-ip w)))
+         (cond [(char=? inst #\,)
+                (exec-in w get-input (lambda (ps) (execute ps done get-input)))]
+               [else (execute (cond [(char=? inst #\+) (exec-add1 w)]
+                                    [(char=? inst #\-) (exec-sub1 w)]
+                                    [(char=? inst #\<) (exec-tape-left w)]
+                                    [(char=? inst #\>) (exec-tape-right w)]
+                                    [(char=? inst #\[) (exec-loop-start w)]
+                                    [(char=? inst #\]) (exec-loop-end w)]
+                                    [(char=? inst #\.) (exec-out w)]) done get-input)])]))
 
 ; Tests for execute
 (check-expect (execute (prog-state (list 0) 0 3 "" "" 0))