[TASK] Solved part 1

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser

.idea/advent-of-code-2023-go.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/advent-of-code-2023-go.iml" filepath="$PROJECT_DIR$/.idea/advent-of-code-2023-go.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

day01/day01.go

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+package day01
+
+import (
+	"strings"
+	"unicode"
+)
+
+func Part1(input string) uint {
+	lines := strings.Split(input, "\n")
+	sum := uint(0)
+	for i := 0; i < len(lines); i++ {
+		line := lines[i]
+		for j := 0; j < len(line); j++ {
+			if unicode.IsNumber(rune(line[j])) {
+				sum = sum + uint(line[j]-'0')*10
+				break
+			}
+		}
+		for j := len(line) - 1; j >= 0; j-- {
+			if unicode.IsNumber(rune(line[j])) {
+				sum = sum + uint(line[j]-'0')
+				break
+			}
+		}
+	}
+
+	return sum
+}
+
+func Part2(input string) uint {
+	lines := strings.Split(input, "\n")
+	sum := uint(0)
+	for i := 0; i < len(lines); i++ {
+		line := lines[i]
+		for j := 0; j < len(line); j++ {
+			n, found := writtenNumberAt(line, j)
+			if found {
+				sum = sum + n*10
+				break
+			}
+		}
+		for j := len(line) - 1; j >= 0; j-- {
+			n, found := writtenNumberAt(line, j)
+			if found {
+				sum = sum + n
+				break
+			}
+		}
+	}
+
+	return sum
+}
+
+func writtenNumberAt(line string, i int) (n uint, found bool) {
+
+	if unicode.IsNumber(rune(line[i])) {
+		return uint(line[i] - '0'), true
+	} else if strings.HasPrefix(line[i:], "one") {
+		return 1, true
+	} else if strings.HasPrefix(line[i:], "two") {
+		return 2, true
+	} else if strings.HasPrefix(line[i:], "three") {
+		return 3, true
+	} else if strings.HasPrefix(line[i:], "four") {
+		return 4, true
+	} else if strings.HasPrefix(line[i:], "five") {
+		return 5, true
+	} else if strings.HasPrefix(line[i:], "six") {
+		return 6, true
+	} else if strings.HasPrefix(line[i:], "seven") {
+		return 7, true
+	} else if strings.HasPrefix(line[i:], "eight") {
+		return 8, true
+	} else if strings.HasPrefix(line[i:], "nine") {
+		return 9, true
+	} else {
+		return 0, false
+	}
+}

go.mod

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+module advent-of-code-2023-go
+
+go 1.21

input/day01_example.txt

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+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

input/day01_example2.txt

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+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

main.go

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+package main
+
+import (
+	"advent-of-code-2023-go/day01"
+	"advent-of-code-2023-go/utils"
+	"os"
+)
+
+func main() {
+
+	d := day()
+	input := utils.Readfile(d, false)
+	switch d {
+	case 1:
+		println("Day 1, part 1: ", day01.Part1(input))
+		println("Day 1, part 1: ", day01.Part2(input))
+	}
+}
+
+func day() int {
+	latest := 1
+	if len(os.Args) == 1 {
+		return latest
+	}
+	day := utils.MustAtoi(os.Args[1])
+	return day
+}

utils/utils.go

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+package utils
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func PanicOnErr(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func MustAtoi(s string) int {
+	v, err := strconv.Atoi(s)
+	PanicOnErr(err)
+	return v
+}
+
+func Readfile(day int, example bool) string {
+	filename := fmt.Sprintf("input/day%02d.txt", day)
+	if example {
+		filename = fmt.Sprintf("input/day%02d_example.txt", day)
+	}
+	file, err := os.Open(filename)
+	PanicOnErr(err)
+	defer file.Close()
+
+	reader := bufio.NewReader(file)
+	contents, err := io.ReadAll(reader)
+	PanicOnErr(err)
+
+	return strings.TrimSuffix(string(contents), "\n")
+}