X655: Words less than 20

Write a function fullWords(s) that returns a string no longer than 20 characters. If the string s is longer than 20 characters, just truncate at the space closest to the 20th position (so no word is truncated) and return it. If the string s is shorter 20 characters, just return it unchanged.

Examples:

fullWords("Injustice anywhere is a threat to justice everywhere.") -> "Injustice anywhere"

fullWords("Is a threat to justice everywhere.") -> "Is a threat to"

fullWords("Justice everywhere.") -> "Justice everywhere."

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