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"

Example 2:

Input: "here"
Output: "here"

Example 3:

Input: "LOVELY"
Output: "lovely"

Runtime: 0 ms, faster than 100.00% of Rust online submissions for To Lower Case.

impl Solution {
    pub fn to_lower_case(str: String) -> String {
        let mut result = String::with_capacity(str.len());
        for c in str.chars() {
            let code = c as u8;
            if code >= 65 && code <= 90 {
                let newCode = code + 32;
                result.push(newCode as char);
            } else {
                result.push(c);
            }
        }
        result
    }
}