reorder structure

src/light_data/light_data.py

@@ -0,0 +1,20 @@
+class light_data:
+    def __init__(self, length=10):
+        self.max = length
+        self.data = []
+
+    def push(self, element):
+        if self.max == 0:
+            return False
+        if len(self.data) == self.max:
+            _ = self.data.pop(0)
+        self.data.append(element)
+        return True
+
+    def average(self):
+        if len(self.data) != self.max:
+            return None
+        return sum(self.data) / self.max
+
+    def length(self):
+        return len(self.data)