Move Pieces to Obtain a String

You are given two strings `start` and `target`, both of length `n`. Each string consists **only** of the characters `'L'`, `'R'`, and `'_'` where: - The characters `'L'` and `'R'` represent pieces, where a piece `'L'` can move to the **left** only if there is a **blank** space directly to its left, and a piece `'R'` can move to the **right** only if there is a **blank** space directly to its right. - The character `'_'` represents a blank space that can be occupied by **any** of the `'L'` or `'R'` pieces. Return `true` _if it is possible to obtain the string_ `target`_ by moving the pieces of the string _`start`_ **any** number of times_. Otherwise, return `false`.   **Example 1:** **Input:** start = "_L__R__R_", target = "L______RR" **Output:** true **Explanation:** We can obtain the string target from start by doing the following moves: - Move the first piece one step to the left, start becomes equal to "**L**___R__R_". - Move the last piece one step to the right, start becomes equal to "L___R___**R**". - Move the second piece three steps to the right, start becomes equal to "L______**R**R". Since it is possible to get the string target from start, we return true. ``` **Example 2:** **Input:** start = "R_L_", target = "__LR" **Output:** false **Explanation:** The 'R' piece in the string start can move one step to the right to obtain "_**R**L_". After that, no pieces can move anymore, so it is impossible to obtain the string target from start. ``` **Example 3:** **Input:** start = "_R", target = "R_" **Output:** false **Explanation:** The piece in the string start can move only to the right, so it is impossible to obtain the string target from start. ```   **Constraints:** - `n == start.length == target.length` - `1 <= n <= 105` - `start` and `target` consist of the characters `'L'`, `'R'`, and `'_'`.