input: def is_content(string):
      """Given a string `string`, determine if it is content.
      A string is content if its length is at least 3 and every 3 consecutive characters are different.
      For example:
      is_content(a) => False
      is_content(aa) => False
      is_content(abcd) => True
      is_content(aabb) => False
      is_content(adb) => True
      is_content(xyy) => False
      """
output:     
      if len(string) < 3:
          return False
      for i in range(len(string) - 2):
          if string[i] == string[i+1] or string[i+1] == string[i+2] or string[i] == string[i+2]:
              return False
      return True
  