def to_binary(string: str) -> str:
    """
    Convert String to numerical binary numbers
    returns numerical binary string
    :param string: String to convert

    Example:
        >>> to_binary("test")
        >>> "1110100 1100101 1110011 1110100"
    """
    bin_conv = []
    for c in string:
        ascii_val = ord(c)
        binary_val = bin(ascii_val)
        bin_conv.append(binary_val[2:])

    return ' '.join(bin_conv)