refactor: improve the fibonacci command

README.md

@@ -19,9 +19,10 @@ aiming to craft C++ plugins for the Bedrock Dedicated Servers using Endstone.
 ```
 cpp-plugin-template/
 ├── include/                      # Header files for the plugin
-│   └── endstone_cpp_plugin.h     # Header for the EndstoneCppPlugin class
+│   ├── example_plugin.h          # Header for the ExamplePlugin class
+│   └── fibonacci_command.h       # Header for the FibonacciCommand class
 ├── src/                          # Source files for the plugin
-│   └── endstone_cpp_plugin.cpp   # Implementation for the EndstoneCppPlugin class
+│   └── example_plugin.cpp        # Implementation for the ExamplePlugin class
 ├── .clang-format                 # Configuration for Clang format rules
 ├── .gitignore                    # Git ignore rules
 ├── CMakeLists.txt                # CMake configuration for building the plugin

include/fibonacci_command.h

@@ -5,13 +5,13 @@
 #include "endstone/command/command.h"
 #include "endstone/command/command_executor.h"
 
-#include <sstream> // for std::ostringstream
+#include <string>
 
 class FibonacciCommand : public endstone::Command {
 public:
     FibonacciCommand() : Command("fibonacci")
     {
-        setDescription("A simple command that prints out the fibonacci series for n <= 20");
+        setDescription("A simple command that writes the Fibonacci series up to n.");
         setAliases("fib");
         setUsages("/fibonacci <n: int>");
     }
@@ -23,23 +23,24 @@ class FibonacciCommandExecutor : public endstone::CommandExecutor {
                    const std::vector<std::string> &args) override
     {
         int n = std::stoi(args[0]);
-        if (n > 0 && n <= 20) {
-            int t1 = 1, t2 = 1, next;
-            std::ostringstream os;
-            for (int i = 1; i <= n; ++i) {
-                if (i > 1) {
-                    os << ", ";
+        if (n > 0) {
+            int a = 0, b = 1;
+            std::string result;
+            while (a < n) {
+                if (!result.empty()) {
+                    result += ", ";
                 }
-                os << t1;
-                next = t1 + t2;
-                t1 = t2;
-                t2 = next;
+
+                result += std::to_string(a);
+                int temp = b;
+                b = a + b;
+                a = temp;
             }
-            sender.sendMessage("Fibonacci Series (n = {}): {}", n, os.str());
+            sender.sendMessage("Fibonacci series up to {}: {}", n, result);
             return true;
         }
         else {
-            sender.sendErrorMessage("'n' must be greater than 0 and less than or equal to 20.");
+            sender.sendErrorMessage("'n' must be an integer greater than 0.");
             return false;
         }
     }