[refactor] Organize STRING

kernel/scheduler/scheduler.cpp

@@ -53,12 +53,7 @@ task_t* task_create(const char* name, void (*entry)(void)) {
     task->time_slice = TIME_SLICE_DEFAULT;
 
     // Copy name
-    const char* s = name;
-    char* d = task->name;
-    for (SSINT32 i = 0; i < TASK_NAME_LEN - 1 && *s; i++) {
-        *d++ = *s++;
-    }
-    *d = '\0';
+    str_copy(task->name, name, TASK_NAME_LEN);
 
     // Set up initial stack for first context_switch into this task.
     // Stack grows downward. context_switch will pop 6 regs then ret.