[Meherab-hsn]

Fixes #7671.

MazeRecursion read the target cell as map[6][5], so any maze smaller than that crashed with ArrayIndexOutOfBoundsException. I reproduced it with a simple 5x5 maze before fixing.

What changed:

• The target is now derived from the map size: map[map.length - 2][map[0].length - 2]. For the existing 8x7 maze in the tests this is exactly the same cell as before, so behaviour on current mazes does not change.
• Null or degenerate (smaller than 3x3) maps now return null instead of crashing.
• Added tests: a 5x5 maze for both strategies, and an unsolvable maze that returns null for both strategies.

MazeRecursionTest passes locally (3/3), including the original 8x7 test, unchanged.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.25%. Comparing base (410f087) to head (9e1eb8b).

Files with missing lines	Patch %	Lines
.../com/thealgorithms/backtracking/MazeRecursion.java	33.33%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7720      +/-   ##
============================================
+ Coverage     82.22%   82.25%   +0.03%     
- Complexity     8402     8408       +6     
============================================
  Files           843      843              
  Lines         26143    26147       +4     
  Branches       5101     5103       +2     
============================================
+ Hits          21495    21507      +12     
+ Misses         3854     3847       -7     
+ Partials        794      793       -1     

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