Write a function that takes a sentence as input and returns a new sentence where the first letter of each word is capitalized, and the rest of the letters are in lowercase.
Input: A string sentence containing one or more words separated by spaces.
Output: A new string where each word starts with an uppercase letter followed by lowercase letters.
Example Inputs & Outputs
// Example 1:
Input: "hello world"
Output: "Hello World"
// Example 2:
Input: "javaScript is FUN"
Output: "Javascript Is Fun"
// Example 3:
Input: " multiple spaces "
Output: "Multiple Spaces"
// Example 4:
Input: ""
Output: ""
Constraints & Edge Cases
- Input may have multiple spaces between words.
- Input may contain uppercase, lowercase, or mixed-case characters.
- Input can be an empty string.
- Words can contain letters only; punctuation is not considered in this challenge.
- Leading/trailing spaces should be trimmed in the final result.
