Reverse Integer

Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.

Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

Example 1:

      Input: x = 123
      Output: 321
      

Example 2:

      Input: x = -123
      Output: -321
      

Example 3:

      Input: x = 120
      Output: 21
      

Constraints:

• -231 <= x <= 231 - 1