refactoring: changed a var to a more appropriate name

src/convert_time.c

@@ -46,8 +46,8 @@ double converter_days_to_years(double days){
 
 // convert Years in days
 double converter_years_to_days(double years){
-    double amount = years * 365;
-    return amount;
+    double days = years * 365;
+    return days;
 }
 
 // convert Years in Seconds