       ...>   base = String.length(prefix)
       ...>   String.slice(full, base, String.length(full) - base)
       ...> end
-      ...> take_prefix.("Mr. John", "Mr. ")
+      iex> take_prefix.("Mr. John", "Mr. ")
       "John"
 
   Although the function above works, it performs poorly. To

  module.

  In general, the functions in this module rely on the Unicode
  Standard, but does not contain any of the locale specific
  behaviour.

  More information about graphemes can be found in the [Unicode
  Standard Annex #29](http://www.unicode.org/reports/tr29/).

      ...>   base = String.length(prefix)
      ...>   String.slice(full, base..-1)
      ...> end
      iex> take_prefix.("Mr. John", "Mr. ")
      "John"

  While this is much better (we don't traverse `full` twice),
