refactoring: description added

src/arithmeticSubtraction.c

@@ -8,7 +8,7 @@ int* subtraction_integer(int a, int b) {
     *result=a - b;
     return result;
 }
-//arithmetic Subtraction specification float
+//arithmetic Subtraction specification float 2 function
 float* subtraction_float(float a, float b) {
     float* result= malloc(sizeof (float));
     *result=a - b;