simple
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```rust []
impl Solution {
    pub fn make_smallest_palindrome(s: String) -> String {
        let mut result = s.chars().collect::<Vec<_>>();
        let len = result.len();
        for i in 0..(len / 2) {
            let t1 = result[i];
            let t2 = result[len - i - 1];
            if t1 == t2 {
                continue;
            }
            if t1 as u8 > t2 as u8 {
                result[i] = t2;
            } else {
                result[len - i - 1] = t1;
            }
        }
        result.iter().collect::<String>()
    }
}
```
['Rust']