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

storage/zeta/cpp/completed/10101.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+
+using namespace std;
+
+int main() {
+    int sides[3];
+
+    for (int i = 0; i < 3; i++) {
+        cin >> sides[i];
+    }
+
+    if (sides[0] + sides[1] + sides[2] != 180) {
+        cout << "Error";
+        return 0;
+    }
+
+    if (sides[0] == 60 and sides[1] == 60 and sides[2] == 60) {
+        cout << "Equilateral";
+        return 0;
+    }
+    if (sides[0] == sides[1] or sides[0] == sides[2] or sides[1] == sides[2]) {
+        cout << "Isosceles";
+        return 0;
+    }
+
+    cout << "Scalene";
+    return 0;
+
+}