Refactoring: removed multiplication by five function (a*5)

src/multiplication.c

@@ -21,9 +21,7 @@ int multi_left_shift(int a, int b) {
 int multi_right_shift(int a, int b) {
     return a >> b;
 }
-int multi_by_five(int a) {
-    return a * 5;
-}
+
 
 float multi_by_percentage(float num, float percentage) {
     return num * (percentage / 100);

src/multiplication.h

@@ -5,7 +5,7 @@ extern double multi(double num1, double num2);
 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_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);