Changed min Numbers to NULL because negative numbers can be handled too

src/kgV/main.c

@@ -4,8 +4,8 @@
 
 int main(){
     printf("add two numbers:\n");
-    int firstNum = usergetd("first number: ", 0, NULL);
-    int secondNum = usergetd("second number: ", 0, NULL);
+    int firstNum = usergetd("first number: ", NULL, NULL);
+    int secondNum = usergetd("second number: ", NULL, NULL);
     int result = kgV(firstNum, secondNum);
     printf("The result is: %d\n", result);