# format_dollars("2423562534234")
# "$2,423,562,534,234"
# format_dollars("2423562534234.876", 0)
# "$2,423,562,534,234"
# format_dollars("2423562534234.876", 2)
# "$2,423,562,534,234.88"
# format_dollars("2423562534234", 2)
# "$2,423,562,534,234.00"
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