refactoring: changed descriptions and edited layout

src/arithmeticMultiplication_Int.c

@@ -1,15 +1,11 @@
-
-
 #include "arithmeticMultiplication_Int.h"
 #include <stdlib.h>
 
 int* multiplication_integer(int a, int b) {
     int *result = (int*)malloc(sizeof(int));
     if (result == NULL) {
-
         return NULL;
     }
-
     *result = a * b;
 
     return result;

src/arithmeticSubtraction.c

@@ -1,20 +1,22 @@
-
 #include "arithmeticSubtraction.h"
 
 #include <stdlib.h>
-//arithmetic Subtraction specification integer
+
+// arithmetic subtraction integer
 int* subtraction_integer(int a, int b) {
     int* result= malloc(sizeof (int));
     *result=a - b;
     return result;
 }
-//arithmetic Subtraction specification float
+
+// arithmetic subtraction float
 float* subtraction_float(float a, float b) {
     float* result= malloc(sizeof (float));
     *result=a - b;
     return result;
 }
-//arithmetic Subtraction specification double
+
+// arithmetic subtraction double
 double* subtraction_double(double a, double b) {
     double* result= malloc(sizeof (double));
     *result=a - b;