refactor: 优化程序终止和函数调用的输出格式

- 在 CallCommand 中添加换行符，改善函数调用的输出可读性
- 修改 HaltCommand 中的终止消息格式，提高信息的清晰度

src/main/java/org/jcnc/snow/vm/commands/flow/control/CallCommand.java

@@ -80,7 +80,7 @@ public class CallCommand implements Command {
                 new MethodContext("subroutine@" + targetAddr, null));
         callStack.pushFrame(newFrame);
 
-        System.out.println("Calling function at address: " + targetAddr);
+        System.out.println("\nCalling function at address: " + targetAddr);
         return targetAddr;   // jump
     }
 }

src/main/java/org/jcnc/snow/vm/commands/system/control/HaltCommand.java

@@ -59,7 +59,7 @@ public class HaltCommand implements Command {
     @Override
     public int execute(String[] parts, int currentPC, OperandStack operandStack, LocalVariableStore localVariableStore, CallStack callStack) {
         // Output the termination message
-        LoggingUtils.logInfo("Process has ended", "\n");
+        LoggingUtils.logInfo("\nProcess has ended", "");
 
         // Return -1 to indicate the program termination, and the virtual machine will not continue executing subsequent instructions
         return -1;