LeetCode 1047. Remove All Adjacent Duplicates In String

Problem Statement

impl Solution {
    pub fn remove_duplicates(s: String) -> String {
        let mut stack = vec![];
        let mut ans = "".to_string();
        for c in s.chars() {
            if stack.is_empty() || c != *stack.get(stack.len() - 1).unwrap() {
                stack.push(c); continue;
            }
            if c == *stack.get(stack.len() - 1).unwrap() {
                stack.pop();
            }
        }
        while !stack.is_empty() {
            ans.push(stack.pop().unwrap());
        }
        return ans.chars().rev().collect::<String>();
    }
}