Capitalize the first letter of each word in a string.
Description
Write a method that takes a string and returns it with the first letter of each word capitalized. Words are separated by spaces.
Examples:
Input: "hello world"
Output: "Hello World"
Explanation: The first letter of each word is capitalized.
Input: "apex programming language"
Output: "Apex Programming Language"
Explanation: Each word starts with a capital letter.
Input: "a b c"
Output: "A B C"
Explanation: Single letters are also capitalized.
Input: ""
Output: ""
Explanation: Empty string returns empty string.
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