updated folder structure

include/timer.h

@@ -0,0 +1,38 @@
+/**
+ * timer.h
+ * Header for command execution timer functionality
+ */
+
+#ifndef TIMER_H
+#define TIMER_H
+
+#include "common.h"
+
+/**
+ * Format a time interval in milliseconds to a readable string
+ *
+ * @param ms Time in milliseconds
+ * @param buffer Buffer to store formatted time
+ * @param buffer_size Size of the buffer
+ */
+void format_time(double ms, char *buffer, size_t buffer_size);
+
+/**
+ * Implementation of the timer command
+ * Usage: timer COMMAND [ARGS...]
+ *
+ * @param args Command arguments
+ * @return 1 to continue, 0 to exit
+ */
+int lsh_timer(char **args);
+
+/**
+ * Implementation of the time command (alias for timer)
+ * Usage: time COMMAND [ARGS...]
+ *
+ * @param args Command arguments
+ * @return 1 to continue, 0 to exit
+ */
+int lsh_time(char **args);
+
+#endif // TIMER_H