Return the length of the last word in a string. Words are separated by spaces. The string may have leading or trailing spaces. Return 0 for null, empty, or blank input.
Examples:
Input: s = 'Hello World'
Output: 5
Explanation: The last word is 'World' which has length 5
Input: s = ' fly me to the moon '
Output: 4
Explanation: The last word is 'moon' which has length 4
Input: s = 'luffy is still joyboy'
Output: 6
Explanation: The last word is 'joyboy' which has length 6
Input: s = null
Output: 0
Explanation: Null input returns 0
Input: s = ''
Output: 0
Explanation: Empty string returns 0
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