[swift] LeetCode 709. To Lower Case

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

Example 1:

Input: "Hello"
Output: "hello"

1 2	Input: "Hello" Output: "hello"

Example 2:

Input: "here"
Output: "here"

1 2	Input: "here" Output: "here"

Example 3:

Input: "LOVELY"
Output: "lovely"

1 2	Input: "LOVELY" Output: "lovely"

return str.lowercased()

1	return str.lowercased()