add node struct to c binary tree

data-structures/trees/binary-tree/c/binary-tree.c

@@ -0,0 +1,47 @@
+#include "binary-tree.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+Node* create_node(int data){
+  Node* node = malloc(sizeof(Node));
+  node->data = data;
+  node->left = NULL;
+  node->right = NULL;
+  return node;
+}
+
+void free_node(Node* node){
+  if (node->left != NULL) {
+    free_node(node->left);
+  }
+  if (node->right != NULL){
+    free_node(node->right);
+  }
+  free(node);
+}
+
+void print_node(Node* node){
+  if (node->right != NULL) {
+    printf("-");
+    print_node(node->right);
+  }
+  printf("%d", node->data);
+  if (node->left != NULL) {
+    printf("-");
+    print_node(node->left);
+  }
+}
+
+Node* get_left(Node* node){
+  return node->left;
+}
+Node* get_right(Node* node){
+  return node->right;
+}
+
+void set_left(Node* parent, Node* child){
+  parent->left = child;
+}
+void set_right(Node* parent, Node* child){
+  parent->right = child;
+}