restructure zeta/** to storage/zeta/**

storage/zeta/cpp/completed/5073.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+#include <algorithm>
+
+using namespace std;
+
+
+int main() {
+    int sides[3];
+    while (true) {
+        for (int i = 0; i < 3; i++) {
+            cin >> sides[i];
+        }
+
+        if (sides[0] == 0) {
+            break;
+        }
+        sort(sides, sides + 3);
+
+        if (sides[0] + sides[1] <= sides[2]) {
+            cout << "Invalid\n";
+            continue;
+        }
+
+        if (sides[0] == sides[1] and sides[1] == sides[2] and sides[2] == sides[0]) {
+            cout << "Equilateral\n";
+            continue;
+        }
+        if (sides[0] == sides[1] or sides[0] == sides[2] or sides[1] == sides[2]) {
+            cout << "Isosceles\n";
+            continue;
+        }
+
+        cout << "Scalene\n";
+    }
+}