refactoring: change variable names, format code and attach some descriptive comments in calculatorFactorial.c

src/calculatorFactorial.c

@@ -1,6 +1,13 @@
 #include "calculatorFactorial.h"
-int calculatorFactorial(int x)
+int calculatorFactorial(int num)  //implement recursion. The function calls itself so many times, till the breaking condition is fulfilled.
 {
-    if (x==0)return 1;
-    else return x*calculatorFactorial(x-1);
+    if (num == 0)  //breaking condition
+    {
+        return 1;
+    }
+    else
+    {
+        return num * calculatorFactorial(num - 1); //If its not breaking condition, then multiply the number with the same function implemented on the previous number. Eventually it will reach breaking condition.
+    }
 }
+

src/calculatorFactorial.h

@@ -3,6 +3,6 @@
 
 #include<stdio.h>
 #include<stdlib.h>
-int calculatorFactorial(int x);
+int calculatorFactorial(int num);
 
 #endif // CALCULATORFACTORIAL_H