Add: add second day solutions

python/src/2-day/solution1.py

@@ -0,0 +1,18 @@
+with open("./src/2-day/input.txt", "r") as file:
+    durs = file.readline().split(",")
+
+    correct_cnt = 0
+
+    for dur in durs:
+        first, last = map(int, dur.split("-"))
+
+        for number in range(first, last + 1):
+            number = str(number)
+
+            if len(number) % 2:
+                continue
+
+            if number[: len(number) // 2] * 2 == number:
+                correct_cnt += int(number)
+
+    print(correct_cnt)