<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def load_string(reader):
 """ Loads string from binary stream :param reader: :return: """

    ivalue = await load_varint(reader)
    fvalue = bytearray(ivalue)
    await reader.areadinto(fvalue)
    return bytes(fvalue)