Added solution 617

Author: brenobaptista

leetcode/0617.Merge-Two-Binary-Trees/617. Merge Two Binary Trees.go

@@ -0,0 +1,33 @@
+package leetcode
+
+import (
+	"github.com/halfrost/LeetCode-Go/structures"
+)
+
+// TreeNode define
+type TreeNode = structures.TreeNode
+
+/**
+ * Definition for a binary tree node.
+ * type TreeNode struct {
+ *     Val int
+ *     Left *TreeNode
+ *     Right *TreeNode
+ * }
+ */
+
+func mergeTrees(root1 *TreeNode, root2 *TreeNode) *TreeNode {
+	if root1 == nil {
+		return root2
+	}
+
+	if root2 == nil {
+		return root1
+	}
+
+	root1.Val += root2.Val
+	root1.Left = mergeTrees(root1.Left, root2.Left)
+	root1.Right = mergeTrees(root1.Right, root2.Right)
+
+	return root1
+}