input: Write a function to convert a string to its binary representation separated by spaces.
  assert bin_from_text("abc") == "1100001 1100010 1100011 "
  assert bin_from_text("Hello") == "1001000 1100101 1101100 1101100 1101111 "
  assert bin_from_text("123") == "110001 110010 110011 "
output: def bin_from_text(s):
      return ' '.join(format(ord(char), 'b') for char in s) + ' '