Added unit tests and workflow call for same

functions/fibonacci.go

@@ -1,9 +1,18 @@
 package functions
 
-func MyFibonacci(count int) (fibonaccivalue int) {
+import(
+	"errors"
+	"fmt"
+)
+
+func MyFibonacci(count int) (fibonaccivalue int, error error) {
 	fibonaccivalue = 1
+	error = nil
 	var prev_fibonacci int = 0
 
+	if count < 1 {
+		return -1, errors.New(fmt.Sprintf("%d is not a positive integer.",count))
+	}
 	for i := 1; i < count; i++ {
 		fibonaccivalue += prev_fibonacci
 		prev_fibonacci = fibonaccivalue - prev_fibonacci