add logarithmic Function

src/logarithmicFunctions.c

@@ -0,0 +1,18 @@
+#include "logarithmicFunctions.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+double* logarithm_two_integer(int base, int num){
+    if(base <= 1 || num <= 0){
+        return NULL;
+    }
+
+    double* result = (double*)malloc(sizeof(double));
+    if (result == NULL) {
+        return NULL;
+    }
+
+    *result = log(num) / log(base);
+    return result;
+}

src/logarithmicFunctions.h

@@ -0,0 +1,6 @@
+#ifndef THEADMIRALS_LOGARITHMICFUNCTIONS_H
+#define THEADMIRALS_LOGARITHMICFUNCTIONS_H
+
+double* logarithm_two_integer(int base, int num);
+
+#endif //THEADMIRALS_LOGARITHMICFUNCTIONS_H

test/test_logarithmicFunctions.c

@@ -0,0 +1,18 @@
+#include "../src/logarithmicFunctions.h"
+#include "unity.h"
+#include "limits.h"
+
+void setUp(void) {
+    // set stuff up here
+}
+
+void tearDown(void) {
+    // clean stuff up here
+}
+
+void test_logarithmicFunctions_logarithmiccalculation(void){
+    double expectedResult = 3.000000;
+    double* result;
+    result = logarithm_two_integer(2,8);
+    TEST_ASSERT_EQUAL_DOUBLE(expectedResult, *result);
+}