Count the number of words in a string. Words are separated by one or more spaces. Return 0 for null or empty strings, and for strings containing only whitespace.

Examples:

Input: str = 'hello world' Output: 2
Input: str = 'apex is great' Output: 3 Explanation: Multiple consecutive spaces count as one delimiter
Input: str = 'singleword' Output: 1
Input: str = null Output: 0
Input: str = ' ' Output: 0 Explanation: A whitespace-only string has no words
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