string to acronym

acronym.rb

acronym = ''
bytes = [] # Byte array
long_string = ' ' + long_string # so the first letter, if capital, is included
long_string.each_byte {|byte| bytes.push(byte)} # Build array of bytes
bytes.each_with_index do |byte, index|
  if byte > 64 and byte < 96 # This is the range for ASCII capital letters, your encoding may vary
    # Capital letter
    if bytes[index-1] == 32 # We check behind to see if the 
                            #letter is preceded by a space. Again, encoding may vary. 32 is ASCII space.
      acronym = acronym + long_string[index,1]
    end
  end
end