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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