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A legacy log line stores its fields in reverse order, separated by one or more spaces, sometimes with leading or trailing padding.
Return the fields in the correct order, separated by exactly one space, with no leading or trailing space.
" disk full errno=28 "["disk", "full", "errno=28"]tokenise, dropping padding["errno=28", "full", "disk"]reverse"errno=28 full disk"join with single spaces"errno=28 full disk"Sign in to keep a note here. It is free, and nobody else can see it.
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O(n) time · O(n) space
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Padding and repeated spaces collapse.
Example 2