Renamed Datastructures -> Data Structure

Following uniform naming convention in the repo

Data Structure/Stack Using Linked List.cpp

@@ -0,0 +1,75 @@
+#include<iostream>
+using namespace std;
+
+struct node
+{
+	int val;
+	node *next;
+};
+
+
+node *top;
+
+void push(int x)
+{
+	node *n = new node;
+	n->val=x;
+	n->next=top;
+	top=n;
+}
+
+void pop()
+{
+	if (top==NULL)
+	{
+		cout<<"\nUnderflow";
+	}
+	else
+	{
+		node *t = top;
+		cout<<"\n"<<t->val<<" deleted";
+		top=top->next;
+		delete t;
+	}
+}
+
+void show()
+{
+	node *t=top;
+	while(t!=NULL)
+	{
+		cout<<t->val<<"\n";
+		t=t->next;
+	}
+}
+
+int main()
+{
+	int ch, x;
+	do
+	{
+		cout<<"\n1. Push";
+		cout<<"\n2. Pop";
+		cout<<"\n3. Print";
+		cout<<"\nEnter Your Choice : ";
+		cin>>ch;
+		if (ch==1)
+		{
+			cout<<"\nInsert : ";
+			cin>>x;
+			push(x);
+		}
+		else if (ch==2)
+		{
+			pop();
+		}
+		else if (ch==3)
+		{
+			show();
+		}
+	}
+	while(ch!=0);
+
+	return 0;
+}
+