added fibonnaci in CSharp

algorithms/CSharp/src/Maths/fibonacci-series.cs

@@ -1,15 +1,16 @@
+using System;
 using System.Collections.Generic;
 
 namespace Algorithms.Maths {
-    public class fibonacci_series {
-        // Fibonacci Series using Recursion and Memoization
+    
+    // Fibonacci Series using Recursion and caching
+    public class FibonacciSequence {
         public static int[] FibonacciSeries(int n) {
             var memo = new Dictionary<int, int>();
             var result = new int[n];
             for (int i = 0; i < n; i++) {
                 result[i] = Fibonacci(i, memo);
             }
-
             return result;
         }
 
@@ -17,11 +18,9 @@ namespace Algorithms.Maths {
             if (n == 0 || n == 1) {
                 return n;
             }
-
             if (memo.ContainsKey(n)) {
                 return memo[n];
             }
-
             memo[n] = Fibonacci(n - 1, memo) + Fibonacci(n - 2, memo);
             return memo[n];
         }

algorithms/CSharp/test/Maths/fibonacci-seires.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using NUnit.Framework;
+
+namespace Algorithms.Tests.Maths {
+    [TestFixture]
+    public class fibonacci_seires {
+        
+        [TestCase(20, new int[] { 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181 })]
+        
+        [TestCase(30, new int[] { 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229 })]
+        
+        public void CalculateFibonacciSeriesTest(int value, int[] expected) {
+            var result = Algorithms.Maths.FibonacciSequence.FibonacciSeries(value);
+            Assert.AreEqual(expected, result);
+        }
+
+    }
+}

algorithms/CSharp/test/Number-Theory/fibonacci-seires.cs

@@ -1,19 +0,0 @@
-using System.Collections.Generic;
-using NUnit.Framework;
-
-namespace Algorithms.Tests.Number_Theory {
-    [TestFixture]
-    public class fibonacci_seires {
-        
-        [TestCase(34, 0, 1, 1, 2, 3, 5, 8, 13, 21, 34)]
-        
-  
-        
-        
-        public void CalculateFibonacciSeriesTest(int value, int[] expected) {
-            var result = Algorithms.Maths.fibonacci_series.FibonacciSeries(value);
-            Assert.AreEqual(expected, result);
-        }
-
-    }
-}