chore: create new project structure and aoc.py runner script

adventofcode/2020/day2/part2.py

@@ -0,0 +1,28 @@
+#! /usr/bin/env python3
+
+
+def xor(a, b):
+    return (a and not b) or (not a and b)
+
+
+def parse_line(line):
+    repeat_range, letter, pwd = line.split(' ')
+    letter = letter[0]
+    first_pos, second_pos = repeat_range.split('-')
+    first_pos, second_pos = int(first_pos), int(second_pos)
+    return letter, first_pos, second_pos, pwd
+
+
+def test_password(line):
+    letter, first_pos, second_pos, pwd = parse_line(line)
+    return xor(pwd[first_pos - 1] == letter,
+        pwd[second_pos - 1] == letter)
+
+
+def main(passwds):
+    valid_counter = 0
+    for l in passwds:
+        if test_password(l):
+            valid_counter += 1
+    print(f"Number of  valid password in input : {valid_counter}")
+