added day 1 code and updated organiser

day_1/part 1 solution.py

@@ -0,0 +1,42 @@
+import re
+
+with open('advent_of_code_2023\day_1\input.txt', 'r') as file:
+    input = file.read()
+
+def grab_first_and_last_digit(line: str) -> (int):
+    '''Returns the first and last digit of the given line
+    input: line - string of characters 
+    output: a 2 digit integer
+    
+    example:
+    input: 'pqr3stu8vwx'
+    output: 38
+    '''
+    first_digit = re.findall(r'\d', line)[0]
+    last_digit = re.findall(r'\d', line)[-1]
+    return int(first_digit + last_digit)
+
+def day_1_solution(input:str) -> int:
+    '''Returns the sum of the first and last digit of each line
+    input: input - string of characters
+    output: an integer
+    
+    example:
+    input: '1abc2\npqr3stu8vwx\na1b2c3d4e5f\ntreb7uchet'
+    output: 48
+    '''
+    list = []
+    for line in input.split('\n'):
+        list.append(grab_first_and_last_digit(line))
+
+    return sum(list)
+
+
+test_input = '1abc2\npqr3stu8vwx\na1b2c3d4e5f\ntreb7uchet'
+day_1_test = day_1_solution(test_input)
+print(day_1_test)
+assert day_1_test == 142
+
+day_1_answer = day_1_solution(input)
+print(day_1_answer)
+