Add Guard Statement to large number.

[yeguang-xue]

For number like 1.0E28, it crashes on MacOS due to buffer overflow (but linux/windows seems to be fine, maybe Mac has more strict memory check). E.g. the following statement will fail:

import hollerith as holler

buf = io.StringIO()
holler.write_float(buf, 1e28, 10)
print(buf.getvalue())

Unfortunately some LS-Dyna Keyword Cards have default values 1e28.

[koubaa]

That change looks ok - but we need a test case to cover it.

[Revathyvenugopal162]

@cla-bot rerun

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