2390. Problem: Removing Stars From a String

Description

You are given a string s, which contains stars *.

In one operation, you can:

• Choose a star in s.
• Remove the closest non-star character to its left, as well as remove the star itself.

Return the string after all stars have been removed.

Note:

• The input will be generated such that the operation is always possible.
• It can be shown that the resulting string will always be unique.

Examples

Example 1

Input: s = "leet**cod*e"

Explanation:

• Performing the removals from left to right:
  • The closest character to the 1st star is 't' in "leet**code". s becomes "leecod*e".
  • The closest character to the 2nd star is 'e' in "leecode". s becomes "lecod*e".
  • The closest character to the 3rd star is 'd' in "lecod*e". s becomes "lecoe".
  • There are no more stars, so we return "lecoe".

Solution:

func removeStars(s string) string {
	var stack []rune
	for _, v := range s {
		if v == '*' && len(stack) > 0 {
			stack = stack[:len(stack)-1]
			continue
		}
		stack = append(stack, v)
	}
	return string(stack)
}