bugfix, inBrackets actually works

packages/strings/strings.grnd

@@ -47,6 +47,9 @@ fun -string !mid -string &str -int &idx -int &len
     set &ans ""
     lesser $idx 0 &store
     if $store %end
+    greater $len 0 &store
+    if $store %loop
+    return ""
     @loop
         getstrsize $str &store
         equal $store $idx &store
@@ -66,11 +69,26 @@ fun -string !mid -string &str -int &idx -int &len
 endfun
 
 fun -string !inBrackets -string &str -char &left -char &right -int &instance
-    # Get start idx
+    # Get left idx
     pusharg $str
     pusharg $left
     pusharg $instance
-    call !findCharInstance &store
+    call !findCharInstance &left
+
+    # Get right idx
+    pusharg $str
+    pusharg $right
+    pusharg $instance
+    call !findCharInstance &right
+
+    # Get inner string
+    add $left 1 &left
+    subtract $right $left &store
+    pusharg $str
+    pusharg $left
+    pusharg $store
+    call !mid &store
+    return $store
 endfun
 
 fun -bool !matchStart -string &str -string &instr