leetcode-273-Integer to English Words

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The array is very important, define 3 array of string, one is less than 20, another one is less than hundred, the last one is 1,000, 1,000,000 and 1,000,000,000. Use this three array to handle number in 3 digits at a time.

Error:

1. take care of " ", but I think it is very tricky to handle