Perform matrix Candy Crush elimination

Q: Perform matrix Candy Crush elimination

This question evaluates a candidate's competency in matrix and grid manipulation, neighborhood/adjacency checks, and simulation of state transitions in an array-based board.

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Implement a function that, given an m × n integer matrix representing colored blocks (same integers = same color), performs one round of "Candy-Crush" elimination:

A cell is removed (set to 0) if at least two of its four neighbors (up, down, left, right) share the same color as the cell.

After removals, all remaining non-zero cells in each column fall down to fill empty spaces; zeros rise to the top.

Return the resulting matrix after this single round.

Perform matrix Candy Crush elimination

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