Given a string of words separated by spaces, convert each word to title case where the first letter is uppercase and the rest are lowercase. Return the transformed string. For null input return null, for empty string return empty string.
Examples:
Input: input = "hello world"
Output: "Hello World"
Explanation: Each word has its first letter capitalized
Input: input = "THE QUICK BROWN FOX"
Output: "The Quick Brown Fox"
Explanation: All words are converted to title case regardless of original case
Input: input = ""
Output: ""
Explanation: Empty string returns empty string
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