diff --git a/DIRECTORY.md b/DIRECTORY.md
index eca2453fad0f..f15d65c18c3f 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -13,6 +13,7 @@
           - 📄 [AllPathsFromSourceToTarget](src/main/java/com/thealgorithms/backtracking/AllPathsFromSourceToTarget.java)
           - 📄 [ArrayCombination](src/main/java/com/thealgorithms/backtracking/ArrayCombination.java)
           - 📄 [Combination](src/main/java/com/thealgorithms/backtracking/Combination.java)
+          - 📄 [CombinationSum](src/main/java/com/thealgorithms/backtracking/CombinationSum.java)
           - 📄 [CrosswordSolver](src/main/java/com/thealgorithms/backtracking/CrosswordSolver.java)
           - 📄 [FloodFill](src/main/java/com/thealgorithms/backtracking/FloodFill.java)
           - 📄 [KnightsTour](src/main/java/com/thealgorithms/backtracking/KnightsTour.java)
@@ -28,6 +29,7 @@
         - 📁 **bitmanipulation**
           - 📄 [BcdConversion](src/main/java/com/thealgorithms/bitmanipulation/BcdConversion.java)
           - 📄 [BinaryPalindromeCheck](src/main/java/com/thealgorithms/bitmanipulation/BinaryPalindromeCheck.java)
+          - 📄 [BitRotate](src/main/java/com/thealgorithms/bitmanipulation/BitRotate.java)
           - 📄 [BitSwap](src/main/java/com/thealgorithms/bitmanipulation/BitSwap.java)
           - 📄 [BitwiseGCD](src/main/java/com/thealgorithms/bitmanipulation/BitwiseGCD.java)
           - 📄 [BooleanAlgebraGates](src/main/java/com/thealgorithms/bitmanipulation/BooleanAlgebraGates.java)
@@ -93,6 +95,12 @@
             - 📄 [LFSR](src/main/java/com/thealgorithms/ciphers/a5/LFSR.java)
             - 📄 [Utils](src/main/java/com/thealgorithms/ciphers/a5/Utils.java)
         - 📁 **compression**
+          - 📄 [ArithmeticCoding](src/main/java/com/thealgorithms/compression/ArithmeticCoding.java)
+          - 📄 [BurrowsWheelerTransform](src/main/java/com/thealgorithms/compression/BurrowsWheelerTransform.java)
+          - 📄 [LZ77](src/main/java/com/thealgorithms/compression/LZ77.java)
+          - 📄 [LZ78](src/main/java/com/thealgorithms/compression/LZ78.java)
+          - 📄 [LZW](src/main/java/com/thealgorithms/compression/LZW.java)
+          - 📄 [MoveToFront](src/main/java/com/thealgorithms/compression/MoveToFront.java)
           - 📄 [RunLengthEncoding](src/main/java/com/thealgorithms/compression/RunLengthEncoding.java)
           - 📄 [ShannonFano](src/main/java/com/thealgorithms/compression/ShannonFano.java)
         - 📁 **conversions**
@@ -173,7 +181,6 @@
             - 📄 [FordFulkerson](src/main/java/com/thealgorithms/datastructures/graphs/FordFulkerson.java)
             - 📄 [Graphs](src/main/java/com/thealgorithms/datastructures/graphs/Graphs.java)
             - 📄 [HamiltonianCycle](src/main/java/com/thealgorithms/datastructures/graphs/HamiltonianCycle.java)
-            - 📄 [HierholzerAlgorithm](src/main/java/com/thealgorithms/graph/HierholzerAlgorithm.java)
             - 📄 [JohnsonsAlgorithm](src/main/java/com/thealgorithms/datastructures/graphs/JohnsonsAlgorithm.java)
             - 📄 [KahnsAlgorithm](src/main/java/com/thealgorithms/datastructures/graphs/KahnsAlgorithm.java)
             - 📄 [Kosaraju](src/main/java/com/thealgorithms/datastructures/graphs/Kosaraju.java)
@@ -358,8 +365,10 @@
           - 📄 [WildcardMatching](src/main/java/com/thealgorithms/dynamicprogramming/WildcardMatching.java)
           - 📄 [WineProblem](src/main/java/com/thealgorithms/dynamicprogramming/WineProblem.java)
         - 📁 **geometry**
+          - 📄 [BentleyOttmann](src/main/java/com/thealgorithms/geometry/BentleyOttmann.java)
           - 📄 [BresenhamLine](src/main/java/com/thealgorithms/geometry/BresenhamLine.java)
           - 📄 [ConvexHull](src/main/java/com/thealgorithms/geometry/ConvexHull.java)
+          - 📄 [DDALine](src/main/java/com/thealgorithms/geometry/DDALine.java)
           - 📄 [GrahamScan](src/main/java/com/thealgorithms/geometry/GrahamScan.java)
           - 📄 [Haversine](src/main/java/com/thealgorithms/geometry/Haversine.java)
           - 📄 [MidpointCircle](src/main/java/com/thealgorithms/geometry/MidpointCircle.java)
@@ -372,10 +381,13 @@
           - 📄 [Dinic](src/main/java/com/thealgorithms/graph/Dinic.java)
           - 📄 [Edmonds](src/main/java/com/thealgorithms/graph/Edmonds.java)
           - 📄 [EdmondsKarp](src/main/java/com/thealgorithms/graph/EdmondsKarp.java)
+          - 📄 [HierholzerAlgorithm](src/main/java/com/thealgorithms/graph/HierholzerAlgorithm.java)
+          - 📄 [HierholzerEulerianPath](src/main/java/com/thealgorithms/graph/HierholzerEulerianPath.java)
           - 📄 [HopcroftKarp](src/main/java/com/thealgorithms/graph/HopcroftKarp.java)
           - 📄 [HungarianAlgorithm](src/main/java/com/thealgorithms/graph/HungarianAlgorithm.java)
           - 📄 [PredecessorConstrainedDfs](src/main/java/com/thealgorithms/graph/PredecessorConstrainedDfs.java)
           - 📄 [PushRelabel](src/main/java/com/thealgorithms/graph/PushRelabel.java)
+          - 📄 [StoerWagner](src/main/java/com/thealgorithms/graph/StoerWagner.java)
           - 📄 [StronglyConnectedComponentOptimized](src/main/java/com/thealgorithms/graph/StronglyConnectedComponentOptimized.java)
           - 📄 [TravelingSalesman](src/main/java/com/thealgorithms/graph/TravelingSalesman.java)
           - 📄 [YensKShortestPaths](src/main/java/com/thealgorithms/graph/YensKShortestPaths.java)
@@ -420,6 +432,7 @@
           - 📄 [BinomialCoefficient](src/main/java/com/thealgorithms/maths/BinomialCoefficient.java)
           - 📄 [CatalanNumbers](src/main/java/com/thealgorithms/maths/CatalanNumbers.java)
           - 📄 [Ceil](src/main/java/com/thealgorithms/maths/Ceil.java)
+          - 📄 [ChebyshevIteration](src/main/java/com/thealgorithms/maths/ChebyshevIteration.java)
           - 📄 [ChineseRemainderTheorem](src/main/java/com/thealgorithms/maths/ChineseRemainderTheorem.java)
           - 📄 [CircularConvolutionFFT](src/main/java/com/thealgorithms/maths/CircularConvolutionFFT.java)
           - 📄 [CollatzConjecture](src/main/java/com/thealgorithms/maths/CollatzConjecture.java)
@@ -478,6 +491,7 @@
           - 📄 [Median](src/main/java/com/thealgorithms/maths/Median.java)
           - 📄 [MinValue](src/main/java/com/thealgorithms/maths/MinValue.java)
           - 📄 [Mode](src/main/java/com/thealgorithms/maths/Mode.java)
+          - 📄 [Neville](src/main/java/com/thealgorithms/maths/Neville.java)
           - 📄 [NonRepeatingElement](src/main/java/com/thealgorithms/maths/NonRepeatingElement.java)
           - 📄 [NthUglyNumber](src/main/java/com/thealgorithms/maths/NthUglyNumber.java)
           - 📄 [NumberOfDigits](src/main/java/com/thealgorithms/maths/NumberOfDigits.java)
@@ -531,6 +545,7 @@
           - 📄 [ZellersCongruence](src/main/java/com/thealgorithms/maths/ZellersCongruence.java)
         - 📁 **matrix**
           - 📄 [InverseOfMatrix](src/main/java/com/thealgorithms/matrix/InverseOfMatrix.java)
+          - 📄 [LUDecomposition](src/main/java/com/thealgorithms/matrix/LUDecomposition.java)
           - 📄 [MatrixMultiplication](src/main/java/com/thealgorithms/matrix/MatrixMultiplication.java)
           - 📄 [MatrixRank](src/main/java/com/thealgorithms/matrix/MatrixRank.java)
           - 📄 [MatrixTranspose](src/main/java/com/thealgorithms/matrix/MatrixTranspose.java)
@@ -591,7 +606,6 @@
           - 📄 [PageRank](src/main/java/com/thealgorithms/others/PageRank.java)
           - 📄 [PasswordGen](src/main/java/com/thealgorithms/others/PasswordGen.java)
           - 📄 [PerlinNoise](src/main/java/com/thealgorithms/others/PerlinNoise.java)
-          - 📄 [PrintAMatrixInSpiralOrder](src/main/java/com/thealgorithms/others/PrintAMatrixInSpiralOrder.java)
           - 📄 [QueueUsingTwoStacks](src/main/java/com/thealgorithms/others/QueueUsingTwoStacks.java)
           - 📄 [SkylineProblem](src/main/java/com/thealgorithms/others/SkylineProblem.java)
           - 📄 [TwoPointers](src/main/java/com/thealgorithms/others/TwoPointers.java)
@@ -599,7 +613,14 @@
           - 📁 **cn**
             - 📄 [HammingDistance](src/main/java/com/thealgorithms/others/cn/HammingDistance.java)
         - 📁 **physics**
+          - 📄 [CoulombsLaw](src/main/java/com/thealgorithms/physics/CoulombsLaw.java)
+          - 📄 [DampedOscillator](src/main/java/com/thealgorithms/physics/DampedOscillator.java)
+          - 📄 [ElasticCollision2D](src/main/java/com/thealgorithms/physics/ElasticCollision2D.java)
+          - 📄 [Gravitation](src/main/java/com/thealgorithms/physics/Gravitation.java)
           - 📄 [GroundToGroundProjectileMotion](src/main/java/com/thealgorithms/physics/GroundToGroundProjectileMotion.java)
+          - 📄 [Kinematics](src/main/java/com/thealgorithms/physics/Kinematics.java)
+          - 📄 [ProjectileMotion](src/main/java/com/thealgorithms/physics/ProjectileMotion.java)
+          - 📄 [SimplePendulumRK4](src/main/java/com/thealgorithms/physics/SimplePendulumRK4.java)
         - 📁 **puzzlesandgames**
           - 📄 [Sudoku](src/main/java/com/thealgorithms/puzzlesandgames/Sudoku.java)
           - 📄 [TowerOfHanoi](src/main/java/com/thealgorithms/puzzlesandgames/TowerOfHanoi.java)
@@ -649,7 +670,7 @@
           - 📄 [BoyerMoore](src/main/java/com/thealgorithms/searches/BoyerMoore.java)
           - 📄 [BreadthFirstSearch](src/main/java/com/thealgorithms/searches/BreadthFirstSearch.java)
           - 📄 [DepthFirstSearch](src/main/java/com/thealgorithms/searches/DepthFirstSearch.java)
-          - 📄 [ExponentalSearch](src/main/java/com/thealgorithms/searches/ExponentalSearch.java)
+          - 📄 [ExponentialSearch](src/main/java/com/thealgorithms/searches/ExponentialSearch.java)
           - 📄 [FibonacciSearch](src/main/java/com/thealgorithms/searches/FibonacciSearch.java)
           - 📄 [HowManyTimesRotated](src/main/java/com/thealgorithms/searches/HowManyTimesRotated.java)
           - 📄 [InterpolationSearch](src/main/java/com/thealgorithms/searches/InterpolationSearch.java)
@@ -758,6 +779,7 @@
           - 📄 [SortStack](src/main/java/com/thealgorithms/stacks/SortStack.java)
           - 📄 [StackPostfixNotation](src/main/java/com/thealgorithms/stacks/StackPostfixNotation.java)
           - 📄 [StackUsingTwoQueues](src/main/java/com/thealgorithms/stacks/StackUsingTwoQueues.java)
+          - 📄 [TrappingRainwater](src/main/java/com/thealgorithms/stacks/TrappingRainwater.java)
         - 📁 **strings**
           - 📄 [AhoCorasick](src/main/java/com/thealgorithms/strings/AhoCorasick.java)
           - 📄 [Alphabetical](src/main/java/com/thealgorithms/strings/Alphabetical.java)
@@ -808,6 +830,7 @@
         - 📁 **backtracking**
           - 📄 [AllPathsFromSourceToTargetTest](src/test/java/com/thealgorithms/backtracking/AllPathsFromSourceToTargetTest.java)
           - 📄 [ArrayCombinationTest](src/test/java/com/thealgorithms/backtracking/ArrayCombinationTest.java)
+          - 📄 [CombinationSumTest](src/test/java/com/thealgorithms/backtracking/CombinationSumTest.java)
           - 📄 [CombinationTest](src/test/java/com/thealgorithms/backtracking/CombinationTest.java)
           - 📄 [CrosswordSolverTest](src/test/java/com/thealgorithms/backtracking/CrosswordSolverTest.java)
           - 📄 [FloodFillTest](src/test/java/com/thealgorithms/backtracking/FloodFillTest.java)
@@ -824,6 +847,7 @@
         - 📁 **bitmanipulation**
           - 📄 [BcdConversionTest](src/test/java/com/thealgorithms/bitmanipulation/BcdConversionTest.java)
           - 📄 [BinaryPalindromeCheckTest](src/test/java/com/thealgorithms/bitmanipulation/BinaryPalindromeCheckTest.java)
+          - 📄 [BitRotateTest](src/test/java/com/thealgorithms/bitmanipulation/BitRotateTest.java)
           - 📄 [BitSwapTest](src/test/java/com/thealgorithms/bitmanipulation/BitSwapTest.java)
           - 📄 [BitwiseGCDTest](src/test/java/com/thealgorithms/bitmanipulation/BitwiseGCDTest.java)
           - 📄 [BooleanAlgebraGatesTest](src/test/java/com/thealgorithms/bitmanipulation/BooleanAlgebraGatesTest.java)
@@ -884,6 +908,12 @@
             - 📄 [A5KeyStreamGeneratorTest](src/test/java/com/thealgorithms/ciphers/a5/A5KeyStreamGeneratorTest.java)
             - 📄 [LFSRTest](src/test/java/com/thealgorithms/ciphers/a5/LFSRTest.java)
         - 📁 **compression**
+          - 📄 [ArithmeticCodingTest](src/test/java/com/thealgorithms/compression/ArithmeticCodingTest.java)
+          - 📄 [BurrowsWheelerTransformTest](src/test/java/com/thealgorithms/compression/BurrowsWheelerTransformTest.java)
+          - 📄 [LZ77Test](src/test/java/com/thealgorithms/compression/LZ77Test.java)
+          - 📄 [LZ78Test](src/test/java/com/thealgorithms/compression/LZ78Test.java)
+          - 📄 [LZWTest](src/test/java/com/thealgorithms/compression/LZWTest.java)
+          - 📄 [MoveToFrontTest](src/test/java/com/thealgorithms/compression/MoveToFrontTest.java)
           - 📄 [RunLengthEncodingTest](src/test/java/com/thealgorithms/compression/RunLengthEncodingTest.java)
           - 📄 [ShannonFanoTest](src/test/java/com/thealgorithms/compression/ShannonFanoTest.java)
         - 📁 **conversions**
@@ -1114,8 +1144,10 @@
           - 📄 [WildcardMatchingTest](src/test/java/com/thealgorithms/dynamicprogramming/WildcardMatchingTest.java)
           - 📄 [WineProblemTest](src/test/java/com/thealgorithms/dynamicprogramming/WineProblemTest.java)
         - 📁 **geometry**
+          - 📄 [BentleyOttmannTest](src/test/java/com/thealgorithms/geometry/BentleyOttmannTest.java)
           - 📄 [BresenhamLineTest](src/test/java/com/thealgorithms/geometry/BresenhamLineTest.java)
           - 📄 [ConvexHullTest](src/test/java/com/thealgorithms/geometry/ConvexHullTest.java)
+          - 📄 [DDALineTest](src/test/java/com/thealgorithms/geometry/DDALineTest.java)
           - 📄 [GrahamScanTest](src/test/java/com/thealgorithms/geometry/GrahamScanTest.java)
           - 📄 [HaversineTest](src/test/java/com/thealgorithms/geometry/HaversineTest.java)
           - 📄 [MidpointCircleTest](src/test/java/com/thealgorithms/geometry/MidpointCircleTest.java)
@@ -1128,9 +1160,13 @@
           - 📄 [DinicTest](src/test/java/com/thealgorithms/graph/DinicTest.java)
           - 📄 [EdmondsKarpTest](src/test/java/com/thealgorithms/graph/EdmondsKarpTest.java)
           - 📄 [EdmondsTest](src/test/java/com/thealgorithms/graph/EdmondsTest.java)
+          - 📄 [HierholzerAlgorithmTest](src/test/java/com/thealgorithms/graph/HierholzerAlgorithmTest.java)
+          - 📄 [HierholzerEulerianPathTest](src/test/java/com/thealgorithms/graph/HierholzerEulerianPathTest.java)
           - 📄 [HopcroftKarpTest](src/test/java/com/thealgorithms/graph/HopcroftKarpTest.java)
+          - 📄 [HungarianAlgorithmTest](src/test/java/com/thealgorithms/graph/HungarianAlgorithmTest.java)
           - 📄 [PredecessorConstrainedDfsTest](src/test/java/com/thealgorithms/graph/PredecessorConstrainedDfsTest.java)
           - 📄 [PushRelabelTest](src/test/java/com/thealgorithms/graph/PushRelabelTest.java)
+          - 📄 [StoerWagnerTest](src/test/java/com/thealgorithms/graph/StoerWagnerTest.java)
           - 📄 [StronglyConnectedComponentOptimizedTest](src/test/java/com/thealgorithms/graph/StronglyConnectedComponentOptimizedTest.java)
           - 📄 [TravelingSalesmanTest](src/test/java/com/thealgorithms/graph/TravelingSalesmanTest.java)
           - 📄 [YensKShortestPathsTest](src/test/java/com/thealgorithms/graph/YensKShortestPathsTest.java)
@@ -1172,6 +1208,7 @@
           - 📄 [BinomialCoefficientTest](src/test/java/com/thealgorithms/maths/BinomialCoefficientTest.java)
           - 📄 [CatalanNumbersTest](src/test/java/com/thealgorithms/maths/CatalanNumbersTest.java)
           - 📄 [CeilTest](src/test/java/com/thealgorithms/maths/CeilTest.java)
+          - 📄 [ChebyshevIterationTest](src/test/java/com/thealgorithms/maths/ChebyshevIterationTest.java)
           - 📄 [ChineseRemainderTheoremTest](src/test/java/com/thealgorithms/maths/ChineseRemainderTheoremTest.java)
           - 📄 [CollatzConjectureTest](src/test/java/com/thealgorithms/maths/CollatzConjectureTest.java)
           - 📄 [CombinationsTest](src/test/java/com/thealgorithms/maths/CombinationsTest.java)
@@ -1211,6 +1248,7 @@
           - 📄 [HarshadNumberTest](src/test/java/com/thealgorithms/maths/HarshadNumberTest.java)
           - 📄 [HeronsFormulaTest](src/test/java/com/thealgorithms/maths/HeronsFormulaTest.java)
           - 📄 [JosephusProblemTest](src/test/java/com/thealgorithms/maths/JosephusProblemTest.java)
+          - 📄 [JugglerSequenceTest](src/test/java/com/thealgorithms/maths/JugglerSequenceTest.java)
           - 📄 [KaprekarNumbersTest](src/test/java/com/thealgorithms/maths/KaprekarNumbersTest.java)
           - 📄 [KaratsubaMultiplicationTest](src/test/java/com/thealgorithms/maths/KaratsubaMultiplicationTest.java)
           - 📄 [KeithNumberTest](src/test/java/com/thealgorithms/maths/KeithNumberTest.java)
@@ -1226,6 +1264,7 @@
           - 📄 [MedianTest](src/test/java/com/thealgorithms/maths/MedianTest.java)
           - 📄 [MinValueTest](src/test/java/com/thealgorithms/maths/MinValueTest.java)
           - 📄 [ModeTest](src/test/java/com/thealgorithms/maths/ModeTest.java)
+          - 📄 [NevilleTest](src/test/java/com/thealgorithms/maths/NevilleTest.java)
           - 📄 [NonRepeatingElementTest](src/test/java/com/thealgorithms/maths/NonRepeatingElementTest.java)
           - 📄 [NthUglyNumberTest](src/test/java/com/thealgorithms/maths/NthUglyNumberTest.java)
           - 📄 [NumberOfDigitsTest](src/test/java/com/thealgorithms/maths/NumberOfDigitsTest.java)
@@ -1275,14 +1314,15 @@
             - 📄 [PrimeFactorizationTest](src/test/java/com/thealgorithms/maths/prime/PrimeFactorizationTest.java)
         - 📁 **matrix**
           - 📄 [InverseOfMatrixTest](src/test/java/com/thealgorithms/matrix/InverseOfMatrixTest.java)
+          - 📄 [LUDecompositionTest](src/test/java/com/thealgorithms/matrix/LUDecompositionTest.java)
           - 📄 [MatrixMultiplicationTest](src/test/java/com/thealgorithms/matrix/MatrixMultiplicationTest.java)
           - 📄 [MatrixRankTest](src/test/java/com/thealgorithms/matrix/MatrixRankTest.java)
           - 📄 [MatrixTransposeTest](src/test/java/com/thealgorithms/matrix/MatrixTransposeTest.java)
           - 📄 [MatrixUtilTest](src/test/java/com/thealgorithms/matrix/MatrixUtilTest.java)
           - 📄 [MedianOfMatrixTest](src/test/java/com/thealgorithms/matrix/MedianOfMatrixTest.java)
           - 📄 [MirrorOfMatrixTest](src/test/java/com/thealgorithms/matrix/MirrorOfMatrixTest.java)
+          - 📄 [PrintAMatrixInSpiralOrderTest](src/test/java/com/thealgorithms/matrix/PrintAMatrixInSpiralOrderTest.java)
           - 📄 [SolveSystemTest](src/test/java/com/thealgorithms/matrix/SolveSystemTest.java)
-          - 📄 [TestPrintMatrixInSpiralOrder](src/test/java/com/thealgorithms/matrix/TestPrintMatrixInSpiralOrder.java)
         - 📁 **misc**
           - 📄 [ColorContrastRatioTest](src/test/java/com/thealgorithms/misc/ColorContrastRatioTest.java)
           - 📄 [MapReduceTest](src/test/java/com/thealgorithms/misc/MapReduceTest.java)
@@ -1323,13 +1363,19 @@
           - 📄 [PerlinNoiseTest](src/test/java/com/thealgorithms/others/PerlinNoiseTest.java)
           - 📄 [QueueUsingTwoStacksTest](src/test/java/com/thealgorithms/others/QueueUsingTwoStacksTest.java)
           - 📄 [SkylineProblemTest](src/test/java/com/thealgorithms/others/SkylineProblemTest.java)
-          - 📄 [TestPrintMatrixInSpiralOrder](src/test/java/com/thealgorithms/others/TestPrintMatrixInSpiralOrder.java)
           - 📄 [TwoPointersTest](src/test/java/com/thealgorithms/others/TwoPointersTest.java)
           - 📄 [WorstFitCPUTest](src/test/java/com/thealgorithms/others/WorstFitCPUTest.java)
           - 📁 **cn**
             - 📄 [HammingDistanceTest](src/test/java/com/thealgorithms/others/cn/HammingDistanceTest.java)
         - 📁 **physics**
+          - 📄 [CoulombsLawTest](src/test/java/com/thealgorithms/physics/CoulombsLawTest.java)
+          - 📄 [DampedOscillatorTest](src/test/java/com/thealgorithms/physics/DampedOscillatorTest.java)
+          - 📄 [ElasticCollision2DTest](src/test/java/com/thealgorithms/physics/ElasticCollision2DTest.java)
+          - 📄 [GravitationTest](src/test/java/com/thealgorithms/physics/GravitationTest.java)
           - 📄 [GroundToGroundProjectileMotionTest](src/test/java/com/thealgorithms/physics/GroundToGroundProjectileMotionTest.java)
+          - 📄 [KinematicsTest](src/test/java/com/thealgorithms/physics/KinematicsTest.java)
+          - 📄 [ProjectileMotionTest](src/test/java/com/thealgorithms/physics/ProjectileMotionTest.java)
+          - 📄 [SimplePendulumRK4Test](src/test/java/com/thealgorithms/physics/SimplePendulumRK4Test.java)
         - 📁 **puzzlesandgames**
           - 📄 [SudokuTest](src/test/java/com/thealgorithms/puzzlesandgames/SudokuTest.java)
           - 📄 [TowerOfHanoiTest](src/test/java/com/thealgorithms/puzzlesandgames/TowerOfHanoiTest.java)
@@ -1487,6 +1533,7 @@
           - 📄 [SortStackTest](src/test/java/com/thealgorithms/stacks/SortStackTest.java)
           - 📄 [StackPostfixNotationTest](src/test/java/com/thealgorithms/stacks/StackPostfixNotationTest.java)
           - 📄 [StackUsingTwoQueuesTest](src/test/java/com/thealgorithms/stacks/StackUsingTwoQueuesTest.java)
+          - 📄 [TrappingRainwaterTest](src/test/java/com/thealgorithms/stacks/TrappingRainwaterTest.java)
         - 📁 **strings**
           - 📄 [AhoCorasickTest](src/test/java/com/thealgorithms/strings/AhoCorasickTest.java)
           - 📄 [AlphabeticalTest](src/test/java/com/thealgorithms/strings/AlphabeticalTest.java)