added script for new day

newday.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Check if the correct number of arguments is provided
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 <two_digit_number>"
+    exit 1
+fi
+
+# Get the parameters
+X="$1"
+
+# Validate that X is a two-digit number
+if ! [[ "$X" =~ ^[0-9]{2}$ ]]; then
+    echo "Error: The parameter must be a two-digit number."
+    exit 1
+fi
+
+cp src/template.rs src/day$X.rs
+touch input/day$X.txt
+
+# Define the placeholder you want to replace
+PLACEHOLDER="{{day}}"
+
+# Use sed to replace the placeholder with the desired text
+sed -i "s|$PLACEHOLDER|$X|g" "src/day$X.rs"
+sed -i "s/.*\/\/ PLACEHOLDER.*/pub mod day$X;\n\/\/ PLACEHOLDER/" "src/lib.rs"
+sed -i "s/.*\/\/ PLACEHOLDER.*/($X, day$X::day_main),\n\/\/ PLACEHOLDER/" "src/main.rs"
+
+cargo fmt
+
+echo "seems allright. created template for day $X"