# File lib/adhearsion/core_extensions/string.rb, line 3
        def self.random_char
                case random_digit = rand(62)
                        when  0...10 : random_digit.to_s
                        when 10...36 : (random_digit + 55).chr
                        when 36...62 : (random_digit + 61).chr
                end
        end