feat(go): add iterration/recursion & fix bugs (#698)

codes/go/chapter_computational_complexity/recursion_test.go

@@ -0,0 +1,23 @@
+// File: recursion_test.go
+// Created Time: 2023-08-28
+// Author: Reanon (793584285@qq.com)
+
+package chapter_computational_complexity
+
+import (
+	"fmt"
+	"testing"
+)
+
+/* Driver Code */
+func TestRecursion(t *testing.T) {
+	n := 5
+	res := recur(n)
+	fmt.Println("\n递归函数的求和结果 res = ", res)
+
+	res = tailRecur(n, 0)
+	fmt.Println("\n尾递归函数的求和结果 res = ", res)
+
+	res = fib(n)
+	fmt.Println("\n斐波那契数列的第", n, "项为", res)
+}