Update zero factorial

The Definition of a Zero Factorial
Because zero has no lower numbers but is still in and of itself a number, there is still but one possible combination of how that data set can be arranged: it cannot. This still counts as one way of arranging it, so by definition, a zero factorial is equal to one, just as 1! is equal to one because there is only a single possible arrangement of this data set.

03_recursion/Golang/03_factorial/Factorial.go

@@ -3,7 +3,7 @@ package main
 import "fmt"
 
 func fact(x int) int {
-	if x == 1 {
+	if x == 0 {
 		return 1
 	}