add reame and start day 2

README.md

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+# Advent of code 2023
+
+This is my attempt at advent of cdoe 2023. I decided to use C to learn and give myself a challenge
+
+## How to build and run
+
+```bash
+make run
+```
+
+The makefile in the root directory will drop into every directory and run that directories make file. Building and running every day.

day1/out.txt

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-rm day1 || echo ""
-gcc day1.c ../libs/* -o day1
-./day1 input.txt a
-53194
-./day1 input.txt b
-53706