Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character.
Input: S = "ab#c", T = "ad#c"
Output: true
Explanation: Both S and T become "ac".Input: S = "ab##", T = "c#d#"
Output: true
Explanation: Both S and T become "".Input: S = "a##c", T = "#a#c"
Output: true
Explanation: Both S and T become "c".Input: S = "a#c", T = "b"
Output: false
Explanation: S becomes "c" while T becomes "b".