refactoring: replaced the multi_by_ten (a * 10) , with multi_by_five (a * 5)

src/multiplication.c

@@ -4,6 +4,7 @@
 #include <math.h>
 
 
+
 double multi( double ein1, double ein2) {
     return (ein1 * ein2);
 }
@@ -22,8 +23,8 @@ int multi_left_shift(int a, int b) {
 int multi_right_shift(int a, int b) {
     return a >> b;
 }
-int multi_by_ten(int a) {
-    return a * 10;
+int multi_by_five(int a) {
+    return a * 5;
 }
 
 float multi_by_percentage(float num, float percentage) {

src/multiplication.h

@@ -5,7 +5,7 @@ double square(double x);
 int multi_three_integers(int a, int b, int c);
 int multi_left_shift(int a, int b);
 int multi_right_shift(int a, int b);
-int multi_by_ten(int a);
+int multi_by_five(int a);
 float multi_by_percentage(float num, float percentage);
 int multi_by_random(int num);
 int multi_string(const char* str, int factor);