Why a extra blank appeared in calling number_to_words to convert 541140 to words with andword=','

code:
`import inflect

p = inflect.engine()

print(p.number_to_words(541440))
print(p.number_to_words(541440, andword=','))
`
result:(the extra blank appear after four hunred)
**five hundred and forty-one thousand, four hundred and forty
five hundred, forty-one thousand, four hundred , forty**

Start by reproducing the provided p.number_to_words(541440, andword=',') example and compare it with the default output. Trace the number_to_words entry point and locate existing tests for number formatting or andword handling. Done means the comma-separated wording has no unintended space and the relevant tests cover the corrected output.

Written by the indexing model from the issue text.