Define linkSequentNode function to link a new node to an existing node, prioritizing the left side

src/utils/sequentAst.js

-function sequentAst(value, left, right) {
+// Define sequentNode constructor function
+function sequentNode(value, left, right) {
     this.value = value;
     this.left = left;
     this.right = right;
 }
 
-function isSequentAst(obj) {
-    return obj instanceof sequentAst &&
+// Define isSequentNode function to check if an object is an instance of sequentNode
+function isSequentNode(obj) {
+    return obj instanceof sequentNode &&
         'value' in obj &&
         'left' in obj &&
         'right' in obj;
-}
+}
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+
+// Define linkSequentNode function to link a new node to an existing node, prioritizing the left side
+function linkSequentNode(existingNode, newNode) {
+    if (!isSequentNode(existingNode)) {
+        throw new Error('Existing node must be a sequentNode');
+    }
+    if (!isSequentNode(newNode)) {
+        throw new Error('New node must be a sequentNode');
+    }
+
+    // Prioritize linking to the left
+    if (!existingNode.left) {
+        existingNode.left = newNode;
+    } else if (!existingNode.right) {
+        existingNode.right = newNode;
+    } else {
+        // If both left and right nodes are occupied, recursively try to link to the left child node
+        linkNode(existingNode.left, newNode);
+    }
+}
+
+module.exports = {
+    sequentNode,
+    isSequentNode,
+    linkSequentNode
+};
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