diff --git a/src/exponent.c b/src/exponent.c
index a195240..9873ad3 100644
--- a/src/exponent.c
+++ b/src/exponent.c
@@ -2,6 +2,7 @@
 #include <limits.h>
 
 #include "exponent.h"
+#include "logarithmus.h"
 
 double absD(double x){
     if(x<0){
@@ -68,19 +69,3 @@ double exponential(double x){
     return sum;
 }
 
-
-
-double logN(double x, double eps){
-    if(x <= 0){
-        return -1.0;
-    }    
-    double yn = x - 1.0;
-    double yn1 = yn;
-
-    do{
-        yn = yn1;
-        yn1 = yn + 2 * (x - exponential(yn)) / (x + exponential(yn));
-    } while (absD(yn - yn1) > eps);
-
-    return yn1;
-}
\ No newline at end of file
diff --git a/src/exponent.h b/src/exponent.h
index 14714d9..9b53200 100644
--- a/src/exponent.h
+++ b/src/exponent.h
@@ -4,6 +4,6 @@
 double p(double exp, double base);
 double powerD(double exp, double base);
 double exponential(double x);
-double logN(double x, double eps);
+double absD(double x);
 
 #endif // exponent.h
\ No newline at end of file
diff --git a/src/logarithmus.c b/src/logarithmus.c
index a99e0d9..b5bc971 100644
--- a/src/logarithmus.c
+++ b/src/logarithmus.c
@@ -1,4 +1,20 @@
 #include <stdio.h>
 #include <limits.h>
 
-#include "logarithmus.h"
\ No newline at end of file
+#include "logarithmus.h"
+#include "exponent.h"
+
+double logN(double x, double eps){
+    if(x <= 0){
+        return -1.0;
+    }    
+    double yn = x - 1.0;
+    double yn1 = yn;
+
+    do{
+        yn = yn1;
+        yn1 = yn + 2 * (x - exponential(yn)) / (x + exponential(yn));
+    } while (absD(yn - yn1) > eps);
+
+    return yn1;
+}
\ No newline at end of file
diff --git a/src/logarithmus.h b/src/logarithmus.h
index 2c70dc1..9447319 100644
--- a/src/logarithmus.h
+++ b/src/logarithmus.h
@@ -1,4 +1,6 @@
-#ifndef LOGARITHMUS_H_H
+#ifndef LOGARITHMUS_H
 #define LOGARITHMUS_H
 
-#endif // exponent.h
\ No newline at end of file
+double logN(double x, double eps);
+
+#endif // logarithmus.h
\ No newline at end of file
diff --git a/test/test_exponent.c b/test/test_exponent.c
index ec19222..ae49c01 100644
--- a/test/test_exponent.c
+++ b/test/test_exponent.c
@@ -3,6 +3,7 @@
 #include "unity.h"
 
 #include "exponent.h"
+#include "logarithmus.h"
 
 void setUp(void)
 {
@@ -122,29 +123,4 @@ void test_Exponent_with_negative_number(void){
     TEST_ASSERT_DOUBLE_WITHIN(0.000001, 0.135335, r2);
 }
 
-void test_ln_with_positive_number(void){
-    double r1, r2, r3;
-
-    r1 = logN(1.0, 0.000001);
-    r2 = logN(10.0, 0.000001);
-    r3 = logN(2.5, 0.000001);
-
-    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 0, r1);
-    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 2.302585, r2);
-    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 0.916290, r3);
-}
-
-void test_ln_with_zero_and_negative_numbers(void){
-    double r1, r2, r3;
-
-    r1 = logN(0.0, 0.000001);
-    r2 = logN(-1.0, 0.000001);
-    r3 = logN(-2.5, 0.000001);
-
-    TEST_ASSERT_EQUAL_DOUBLE(-1.0, r1);
-    TEST_ASSERT_EQUAL_DOUBLE(-1.0, r2);
-    TEST_ASSERT_EQUAL_DOUBLE(-1.0, r3);
-}
-
-
 #endif // TEST
\ No newline at end of file
diff --git a/test/test_logarithmus.c b/test/test_logarithmus.c
index 2228e3d..6c056d8 100644
--- a/test/test_logarithmus.c
+++ b/test/test_logarithmus.c
@@ -3,6 +3,7 @@
 #include "unity.h"
 
 #include "logarithmus.h"
+#include "exponent.h"
 
 void setUp(void)
 {
@@ -12,4 +13,29 @@ void tearDown(void)
 {
 }
 
+void test_ln_with_positive_number(void){
+    double r1, r2, r3;
+
+    r1 = logN(1.0, 0.000001);
+    r2 = logN(10.0, 0.000001);
+    r3 = logN(2.5, 0.000001);
+
+    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 0, r1);
+    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 2.302585, r2);
+    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 0.916290, r3);
+}
+
+void test_ln_with_zero_and_negative_numbers(void){
+    double r1, r2, r3;
+
+    r1 = logN(0.0, 0.000001);
+    r2 = logN(-1.0, 0.000001);
+    r3 = logN(-2.5, 0.000001);
+
+    TEST_ASSERT_EQUAL_DOUBLE(-1.0, r1);
+    TEST_ASSERT_EQUAL_DOUBLE(-1.0, r2);
+    TEST_ASSERT_EQUAL_DOUBLE(-1.0, r3);
+}
+
+
 #endif // TEST
\ No newline at end of file