[FIX] Replaced deprecated module std::intrinsics with std::ptr

[vats004]

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This PR resolves the warning posed by depreciated module std::intrinsics by replacing the same with std::mem module

error: use of deprecated module `std::intrinsics`: import this function via `std::mem` instead
  --> src/decoder/window.rs:15:17
   |
15 |     intrinsics::copy_nonoverlapping,
   |                 ^^^^^^^^^^^^^^^^^^^
   |