1812. Determine Color of a Chessboard Square

You are given `coordinates`, a string that represents the coordinates of a square of the chessboard. Below is a chessboard for your reference.

Return `true` if the square is white, and `false` if the square is black.

The coordinate will always represent a valid chessboard square. The coordinate will always have the letter first, and the number second.

Example 1:

```Input: coordinates = "a1"
Output: false
Explanation: From the chessboard above, the square with coordinates "a1" is black, so return false.
```

Example 2:

```Input: coordinates = "h3"
Output: true
Explanation: From the chessboard above, the square with coordinates "h3" is white, so return true.
```

Example 3:

```Input: coordinates = "c7"
Output: false
```

Constraints:

• `coordinates.length == 2`
• `'a' <= coordinates[0] <= 'h'`
• `'1' <= coordinates[1] <= '8'`

1812. Determine Color of a Chessboard Square
``````struct Solution;

impl Solution {
fn square_is_white(coordinates: String) -> bool {
let mut arr: Vec<u8> = coordinates.bytes().collect();
arr[0] -= b'a';
arr[1] -= b'1';
(arr[0] % 2 == 0) ^ (arr[1] % 2 == 0)
}
}

#[test]
fn test() {
let coordinates = "a1".to_string();
let res = false;
assert_eq!(Solution::square_is_white(coordinates), res);
let coordinates = "h3".to_string();
let res = true;
assert_eq!(Solution::square_is_white(coordinates), res);
let coordinates = "c7".to_string();
let res = false;
assert_eq!(Solution::square_is_white(coordinates), res);
}
``````