2024 Day 4 Complete!

2024/day04/input

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+SAMXSASAMSXMXAAAMXMMMMXAMAXAAXSXSSMSSXXAXMXMASASMXAAASMSSXMASXXSMAXAMMSMSSSMXSAAXSAMXAAMXMXXMAMMXSAAAMAAMMMSMSMMAAAAXAAAAMASMMMMSMSMMMAMMMSS
+XAMXMASAMAASMMMMXXSAMXMSMMSSMMSAXAMXMMSMSMXSAMASXSMSXMAAMAMAMMMXSXMXMASAAMAASMMMMAAMSSMMAXMASAXMAMSMSSSSXSAXAXASXMMSSXMSXXMMAXSXXAXAASAMAAXA
+SMMXSAXAMSSMAAMXMASAXXMAAMAMMAMXMAMAXMAAAAXXAMXMXMAXASMSSXMAMAAMAXSMXMMMMSMMMMAAMSMMMAXSASMMSMMMAXAMAMAAAMAMXMAMXMAXMMMMXXXMSMXAMXMXMMAXSSSM
+SSMAMMSMMMMMSMSXSAMXMSSSSMASMSSMSAMASXMSMSMSXMSMMXAMAMAAXXXXSMSXMMAAMXXAMXXXAXSSMMMXSAMXXMAXXAXSXMSAAMMMMMMMXMAMAMXMMAMMXSAAMAMSMMSMSMSMAAMX
+SAMXSXAXAMXAMXXAMXXAAAAAXMMMXAAMSXSMXAAXXMAMMAAAMXMMSMMMMSMXMAMAASMSSMSSSSMMMMMXAAAXMMMMXSMMMMMMAAXSMXSAMAAXXXASMSSMSXSAAMMMMAMAAXAASAXAMXMS
+MXMSXXMSMSMASAMXMASMMMMMMXMXMMSMSASMSMXMMMAMMMSASXMAMAMXAAMXMAXXAMXAAAAAAMSASAMXSMMMMXAAMMSAAMAXXMXASASASXSSXSASAAAAAXMMMSSMSSMMAMMXMAMAXAXS
+MSMMAMXAAMXMMXMAXXMXAXXASAMXXAMXMAMASXAMAXXXAXXAXXMMXMMAMASXMXMMSMMSSSMMMMSXSASMXMXAXSMSXASXSXSSSMSMMMMMMMAAMMXMMSMMMMMAXAAMAXXXSASASXMXSMSS
+MAAMXMSMSMAMXSSMXSMSSMSASMSAMXMAMXMSMSASMMMSASMSMMMSAMXSSMMXMAXSASAMMMMAMXXASAMMXSSXXAXAMMMMMMXAMAAMMMMAAXMSMMAXAAAAXMSSSSSMASMXMASMSASXSMAM
+SSSMAAXAAXAMXAAMMSAAAAMXMAXASASMMMXXAXMAMSAMXAAMAAASASXAAAXMMSXMAMXSASMXSAMXMSMMXMAMXMASXXAAXXMAMSMSASXSMXXMAXSMSSXMSAAAXAAMASXAMXMXSAMAXMXM
+XAAXXSMSMSXXMSAMAMMMMMMMSASMMMAXAXASAMSXMMAMAMXMSXMSXMXSSMMMAMAMXMMSAMAAMXMXAAMMASAMXMSMXSSSMMMSMXAMXSAAMXSXMSAMAXAAXMAMMXMMASXMSAMXMAMSMMSS
+MMMMXXAAMMMXXMAMMMAXAMXMMXXXAXMSSMAMXXXAXSXMAXXMAMXMAMAMXXXMASXMXSAMXMMASAMSSMXSAMMXXSMSAXMAXSAMAMMMSMMMMASAMAMMAMMXMASMSMSMXXXSAMXMSXMXAAAS
+SAAXMMSMSAMXXSAMSSSSXMAAXSMSMMXAAMAMMASXMAXSXMAMAXSMSMASAMXMASMMMMXSAMXASAMXAAXMMMSMMMAMMSMSMMASXXSXAMXMMASAMMXMSSMAXAXAXMASAXSMMSAMXAASXMMS
+AXASAAAASMMSMMAMAAAAASMSMMASASMSMSAXSAXMMSMMAMAMXXSAXMXMAMAMXXAMAMASASMMSXMMMMMXAAAAXMAMXXAAASAMXASMMSMXMAXAMXXMMAXSSMMMXAMXMXXAAXASXMAMAAXX
+MSMMXSMMMMXSMSMMMMMXMXAAAMAMXMAMASAXMXMXXXAMAMXSMAMAMMSMXMASXXSSSMASXMXAMASXMAMXMSSMMSASAMXMAMSSMMMAAAXXMMSSMMXMSAMXAXXMASXMASMXMSMMMMASMMSS
+XAAMMMMAAXAMAMXAMXMMMMSSMMMSAMMMMMMMXSAMXXMSMSAXMAMAMXSAAMSMMAAAAMAMAMMASAMMSASAMMMAASMXAMXXXMXMAXXSAMXMSAAAMXMXMASXMMAMAMASXXAXMAXAMSMSAAAA
+SSMMAAMSMMXSASMSMXXAXAXMXAAMXMAAXAMSSSSSMSAAXMASXSSXSAMMMMAAMXMXMMASAMSXMASXSASASAMMMSMSSSMSXSAMMSAMXXSAMMSMMAAASXMMXMAMMSXMXXXMSASMMSAMMMMS
+AAMSXMMAMAMMASAXAASMMXSSSMSSMSSSSXSMAMAMAAMSMMAMXAXAMXSXMSSSSSMSXMXSXMXMSAMXMXMAMAMSAXXAAAAAXMASMAXMXMAXMAAAMXXXSAXXASMSXMASAMSAMXXMAMAMXSXX
+MMMSASXSXSXMAMMMMMXMAMAAAAMXXAAXXMAMXMAMSMXMXMSSMSMXMMXAXMAMXAAAXSASMSAMMASMMMMAMSMMXSMMSMMMSSMMMXMMMMMMMSSSMSSXXXMSASAXASAMAAAXSXSMSSSMAMXX
+XAMSAMAASAMMXXXXSXMASMMMMMMMMMSXSAMXXSXMMAMXMAXAAXXXXASMMMSMSMMMSMAMASXMSXMAAXSXSXXXMAAMAAAXAXAMSMAXAXXXMMAAXMAMMMAXMMMXXMAXXMSMMXAAAAAMXSAM
+MMMMAMXMMXAXSSSXMASAMXSSMSMSAMAAAMMXMASMXSMMMASMMMSAMMSAAXMAMSAXXMAMXMMXMASMSXMSAMXAMMSSMSSXMSXMAAXSXSMSSMSMMMAMAAMSXAMMSSMSSMXAMSMMMSMMASAS
+MSXSSMMXMXSXAAAMSAMMSMMAAAASMSMSSSMSAMXMAMAXAXAXAMAMXAMXMMMAMAMSSMASAAAAMXSAMXSAMXMMXAAAMAXAAAMSMSAMXSAAXAMXASASXSSXMMSAAAAMMASAMAXAXMAMXMAM
+MAAMAMXAMMMSSXMMMXSASXSMMMMMMXAAAAAMMMSMASXMSXMSMXAXMMSASASASMMAMSMSMSSXSAMAMXXXXASAMMSSMASMMMMMXAAAAMMMSXMMMSASAXMAXMMMSMMMMXMASXSSSSXMMMMM
+MMSMMSSMSAAMXAMXXSMMSAXAAXAMXMMMSMMMAAMMASXMMAXAMMSMSASASASMSXMAMAMXXMXXMXSAMXASXMSASXAXMASAAMAMXSMMMMAAMASXXMAMMMMSMSXAAXASXASXXXSAMXMMAASA
+XAAAXAXASMSMSMMAMXMXMMMSXSASAAXXXASMMXMMMXMAMMMSMMAAMXMMMMMXMASXSMSSXSMXMXSASXAXMASAMMSSSXSMMSSSXMAASXMAMAXXXMASXSSXAXSSXSXXSASASXXMAXAXXSAS
+MMSSSMSXXAAAAASXMAXSAAAAASAMXXASAXMAMAASASXSAMXMASMXMAMXXSMAMAXAAXAAAXAAMMXAMMSMMXMMMXMAMAMMXAMXAXSXSAMAMSSMXSMSAMXMMMMMMMMMMSMAMXAMASMSMMMA
+SAAAAXMMMMMSMXMAMAASMMMSMMAMXASXMXSAMMSMASAXAMASMMAASAMMMMMAMMSSMMXMASXMSASXXAMXMMSXSAMAMAMMMSSSMMXASAMSMMAAXMAMMMXSSMSAAAAASAMXMSSMAXXAASXM
+SMMXMAAXAAXXMASXMMXXMAXMASMMMMMAMMMAXXAMAMASAMMSAMSMSAMXAAXMSAAAXAXXMXMASMAAMXMAASXAAXSXSXSAMAMAXAMAMXMAAXXMXMAMASAMAAAMMMSSSMSAMXAMMSXMMMXX
+XASXMSAMXSMAXMXAXSAMMSSSMMSSSXSAMMSAMMMMASASAMAMMXXMSXMSSSSSMMMSMMSSMAMMMXMXXXMMMAMAMMMXMMMMMMSSXMMXMASXSMASMSXSASAMMMMMSMMMMXSASXMSASMASXXS
+XAMAXMXSAAMXMXXMMMASAXAAXAMXMASASXMAMXASXMASXMASMSMAMAMAAAXMASAXAAAASASAMAXMMMXSMMAAXAMAMAAXXMAAAAMAMMMAXMAXAAXMAMXMMAXXXAAMXMSXMAMMAXXAMAMM
+SSMMMMASMXXMASMSASAMMSSMMXSAAXXASXSASMMMAXAMMSXXAAAASAMMSMASAMXSMMSMMMSASXXXAAAXAMSXSSSSSXSMMMMSMMMAMXMSSMSSSMMMSMASXMSMSSMMAXXMASXMAMMMSSMM
+AAAXXMASXMXXSXXXAMMAMXXXAAMMMSMMMAMASMXSMMXSAMMMSMSMSASXAXMMXSASAXXXMMSXMASMSMSMAMMAXMAXMXXAMMXAMXSMSAMMAAAAAXXAMMXAMXMAAAASMXAMSMAMSMSMAAMX
+MXAMXMXSAMSMMMSMAMSSSSSMMSMSASAAMSMMMMXXXASMXMAXXAXASAMMXXXSXMASXMMXSAMASAMXXAMMSMMSMMXMSASAMXXXXAXXSASMMMMSMMMASMXMSAMMSSMMSSXMAXAMAAAMMMMS
+SASMSXASAMXAAAXMAMXMAAAMAAAMASXMXAXAAMXMMSSMSSMSMAMAMAMXSMASMMAMMMAAMASAMASAMXMAMMAMAMAAMASXMMMSMMSASAMXASXXASMAAXAXMASMMMMAMMMSMXMSMSMSMMAM
+XAMAAMMSAMMSMSXSASXMMMMMMSMMAMXSSMSSXSAMXXMMAASXMMMAMSXAAMAMAMMSAMMXSAMASXMMSSMASMASXMMSMAMMXMASASAXMAMSAMASAXMSSSMSSSMMAAMASAAASAAAAAAAXMAS
+XXMAMMXSMMXAXXMSMSAMXXXXXXXMXSXXAXMMXSASXMXMSSMXAASXSAMXSMSSXMASMMSAMXMXXXSXSMSSXMMSMXSXMASMXMSSSMASMMMSASXMMSAMXMXXMMASMSSXSXSASMSMSMSMSSMS

2024/day04/main.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"fmt"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToCoordMap()
+	part1(inp)
+	part2(inp)
+}
+
+func part1(m h.CoordByteMap) {
+	var total int
+	for y := m.TLY; y <= m.BRY; y++ {
+		for x := m.TLX; x <= m.BRX; x++ {
+			total += checkPos(m, h.Coordinate{X: x, Y: y})
+		}
+	}
+	fmt.Println("# Part 1")
+	fmt.Println("Instances of XMAS:", total)
+}
+
+func part2(m h.CoordByteMap) {
+	var total int
+	for y := m.TLY; y <= m.BRY; y++ {
+		for x := m.TLX; x <= m.BRX; x++ {
+			if checkXPos(m, h.Coordinate{X: x, Y: y}) {
+				total++
+			}
+		}
+	}
+	fmt.Println("# Part 2")
+	fmt.Println("Instances of X-MAS:", total)
+}
+
+// checkPos takes an x,y and returns how many instances of
+// 'XMAS' occur starting there.
+func checkPos(m h.CoordByteMap, c h.Coordinate) int {
+	if m.Get(c) != 'X' {
+		return 0
+	}
+
+	var total int
+	for _, dir := range []h.Coordinate{
+		{X: -1, Y: 0},  // North
+		{X: -1, Y: 1},  // Northeast
+		{X: 0, Y: 1},   // East
+		{X: 1, Y: 1},   // Southeast
+		{X: 1, Y: 0},   // South
+		{X: 1, Y: -1},  // Southwest
+		{X: 0, Y: -1},  // West
+		{X: -1, Y: -1}, // Northwest
+	} {
+		if checkDir(m, c, dir, []byte{'X', 'M', 'A', 'S'}) {
+			total++
+		}
+	}
+	return total
+}
+
+// checkDir follows a direction to look for the word returning true if found.
+func checkDir(m h.CoordByteMap, c h.Coordinate, dir h.Coordinate, word []byte) bool {
+	if len(word) == 0 {
+		return true
+	}
+	if m.Get(c) != word[0] {
+		return false
+	}
+	return checkDir(m, c.Relative(dir), dir, word[1:])
+}
+
+func checkXPos(m h.CoordByteMap, c h.Coordinate) bool {
+	if m.Get(c) != 'A' {
+		return false
+	}
+	// A X-Mas can be:
+	// M S  S M  M M  S S
+	//  A    A    A    A
+	// M S  S M  S S  M M
+	wrk := string([]byte{m.Get(c.NE()), m.Get(c.SW()), m.Get(c.NW()), m.Get(c.SE())})
+	return wrk == "MSMS" || wrk == "SMSM" || wrk == "MSSM" || wrk == "SMMS"
+}

2024/day04/problem

@@ -0,0 +1,107 @@
+                               [1]Advent of Code
+
+     • [2][About]
+     • [3][Events]
+     • [4][Shop]
+     • [5][Settings]
+     • [6][Log Out]
+
+   br0xen [7](AoC++) 6*
+
+                                 {year=>[8]2024}
+
+     • [9][Calendar]
+     • [10][AoC++]
+     • [11][Sponsors]
+     • [12][Leaderboard]
+     • [13][Stats]
+
+   Our [14]sponsors help make Advent of Code possible:
+   [15]Boot.dev - Do Adventers-of-Code make the best backend devs? We think
+   so! If you want to master backend development in Python, SQL, and Go, then
+   try our hands-on courses on Boot.dev! Get 25% off first payment w/promo
+   ADVENTOFCODE
+
+--- Day 4: Ceres Search ---
+
+   "Looks like the Chief's not here. Next!" One of The Historians pulls out a
+   device and pushes the only button on it. After a brief flash, you
+   recognize the interior of the [16]Ceres monitoring station!
+
+   As the search for the Chief continues, a small Elf who lives on the
+   station tugs on your shirt; she'd like to know if you could help her with
+   her word search (your puzzle input). She only has to find one word: XMAS.
+
+   This word search allows words to be horizontal, vertical, diagonal,
+   written backwards, or even overlapping other words. It's a little unusual,
+   though, as you don't merely need to find one instance of XMAS - you need
+   to find all of them. Here are a few ways XMAS might appear, where
+   irrelevant characters have been replaced with .:
+
+ ..X...
+ .SAMX.
+ .A..A.
+ XMAS.S
+ .X....
+
+   The actual word search will be full of letters instead. For example:
+
+ MMMSXXMASM
+ MSAMXMSMSA
+ AMXSXMAAMM
+ MSAMASMSMX
+ XMASAMXAMM
+ XXAMMXXAMA
+ SMSMSASXSS
+ SAXAMASAAA
+ MAMMMXMMMM
+ MXMXAXMASX
+
+   In this word search, XMAS occurs a total of 18 times; here's the same word
+   search again, but where letters not involved in any XMAS have been
+   replaced with .:
+
+ ....XXMAS.
+ .SAMXMS...
+ ...S..A...
+ ..A.A.MS.X
+ XMASAMX.MM
+ X.....XA.A
+ S.S.S.S.SS
+ .A.A.A.A.A
+ ..M.M.M.MM
+ .X.X.XMASX
+
+   Take a look at the little Elf's word search. How many times does XMAS
+   appear?
+
+   To begin, [17]get your puzzle input.
+
+   Answer: [18]_____________________ [19][ [Submit] ]
+
+   You can also [Shareon [20]Bluesky [21]Twitter [22]Mastodon] this puzzle.
+
+References
+
+   Visible links
+   1. https://adventofcode.com/
+   2. https://adventofcode.com/2024/about
+   3. https://adventofcode.com/2024/events
+   4. https://cottonbureau.com/people/advent-of-code
+   5. https://adventofcode.com/2024/settings
+   6. https://adventofcode.com/2024/auth/logout
+   7. Advent of Code Supporter
+	https://adventofcode.com/2024/support
+   8. https://adventofcode.com/2024
+   9. https://adventofcode.com/2024
+  10. https://adventofcode.com/2024/support
+  11. https://adventofcode.com/2024/sponsors
+  12. https://adventofcode.com/2024/leaderboard
+  13. https://adventofcode.com/2024/stats
+  14. https://adventofcode.com/2024/sponsors
+  15. https://adventofcode.com/2024/sponsors/redirect?url=https%3A%2F%2Fwww%2Eboot%2Edev%3Fpromo%3DADVENTOFCODE
+  16. https://adventofcode.com/2019/day/10
+  17. https://adventofcode.com/2024/day/4/input
+  20. https://bsky.app/intent/compose?text=%22Ceres+Search%22+%2D+Day+4+%2D+Advent+of+Code+2024+%23AdventOfCode+https%3A%2F%2Fadventofcode%2Ecom%2F2024%2Fday%2F4
+  21. https://twitter.com/intent/tweet?text=%22Ceres+Search%22+%2D+Day+4+%2D+Advent+of+Code+2024&url=https%3A%2F%2Fadventofcode%2Ecom%2F2024%2Fday%2F4&related=ericwastl&hashtags=AdventOfCode
+  22. javascript:void(0);

2024/day04/testinput

@@ -0,0 +1,10 @@
+MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX

helpers/coordinate.go

@@ -26,24 +26,29 @@ func (c *Coordinate) MoveNE() {
 	c.X++
 	c.Y--
 }
+
 func (c *Coordinate) MoveSE() {
 	c.X++
 	c.Y++
 }
+
 func (c *Coordinate) MoveSW() {
 	c.X--
 	c.Y++
 }
+
 func (c *Coordinate) MoveNW() {
 	c.X--
 	c.Y--
 }
+
 func (c Coordinate) Add(o Coordinate) Coordinate {
 	return Coordinate{
 		X: c.X + o.X,
 		Y: c.Y + o.Y,
 	}
 }
+
 func (c Coordinate) Mul(by int) Coordinate {
 	return Coordinate{
 		X: c.X * by,
@@ -54,36 +59,46 @@ func (c Coordinate) Mul(by int) Coordinate {
 func (c Coordinate) North() Coordinate {
 	return Coordinate{X: c.X, Y: c.Y - 1}
 }
+
 func (c Coordinate) East() Coordinate {
 	return Coordinate{X: c.X + 1, Y: c.Y}
 }
+
 func (c Coordinate) South() Coordinate {
 	return Coordinate{X: c.X, Y: c.Y + 1}
 }
+
 func (c Coordinate) West() Coordinate {
 	return Coordinate{X: c.X - 1, Y: c.Y}
 }
+
 func (c *Coordinate) NW() Coordinate {
 	return Coordinate{X: c.X - 1, Y: c.Y - 1}
 }
+
 func (c *Coordinate) NE() Coordinate {
 	return Coordinate{X: c.X + 1, Y: c.Y - 1}
 }
+
 func (c *Coordinate) SW() Coordinate {
 	return Coordinate{X: c.X - 1, Y: c.Y + 1}
 }
+
 func (c *Coordinate) SE() Coordinate {
 	return Coordinate{X: c.X + 1, Y: c.Y + 1}
 }
+
 func (c *Coordinate) GetOrthNeighbors() []Coordinate {
 	return []Coordinate{c.North(), c.East(), c.South(), c.West()}
 }
+
 func (c *Coordinate) GetAllNeighbors() []Coordinate {
 	return []Coordinate{
 		c.North(), c.NE(),
 		c.East(), c.SE(),
 		c.South(), c.SW(),
-		c.West(), c.NW()}
+		c.West(), c.NW(),
+	}
 }
 
 func (c *Coordinate) GetNorthCoord() *Coordinate {
@@ -92,18 +107,21 @@ func (c *Coordinate) GetNorthCoord() *Coordinate {
 		Y: c.Y - 1,
 	}
 }
+
 func (c *Coordinate) GetEastCoord() *Coordinate {
 	return &Coordinate{
 		X: c.X + 1,
 		Y: c.Y,
 	}
 }
+
 func (c *Coordinate) GetSouthCoord() *Coordinate {
 	return &Coordinate{
 		X: c.X,
 		Y: c.Y + 1,
 	}
 }
+
 func (c *Coordinate) GetWestCoord() *Coordinate {
 	return &Coordinate{
 		X: c.X - 1,
@@ -143,6 +161,7 @@ func (c Coordinate) Distance(t Coordinate) int {
 func (c Coordinate) Equals(c2 Coordinate) bool {
 	return c.X == c2.X && c.Y == c2.Y
 }
+
 func (c Coordinate) Adjacent(c2 Coordinate) bool {
 	return c2.Equals(c.North()) ||
 		c2.Equals(c.NE()) ||
@@ -163,6 +182,7 @@ func GetHighestY(list ...Coordinate) int {
 	}
 	return top
 }
+
 func GetLowestY(list ...Coordinate) int {
 	bot := math.MaxInt
 	for i := range list {
@@ -172,6 +192,7 @@ func GetLowestY(list ...Coordinate) int {
 	}
 	return bot
 }
+
 func GetLowestX(list ...Coordinate) int {
 	bot := math.MaxInt
 	for i := range list {
@@ -181,6 +202,7 @@ func GetLowestX(list ...Coordinate) int {
 	}
 	return bot
 }
+
 func GetHighestX(list ...Coordinate) int {
 	top := math.MinInt
 	for i := range list {

helpers/coordinateByteMap.go

@@ -49,9 +49,11 @@ func StringSliceToCoordByteMap(input []string) CoordByteMap {
 func (m *CoordByteMap) RowCount() int {
 	return m.BRY - m.TLY
 }
+
 func (m *CoordByteMap) ColCount() int {
 	return m.BRX - m.TLX
 }
+
 func (m *CoordByteMap) GetRow(y int) []byte {
 	if m.Repeats {
 		y = (y + m.BRY) % m.BRY
@@ -62,6 +64,7 @@ func (m *CoordByteMap) GetRow(y int) []byte {
 	}
 	return resp
 }
+
 func (m *CoordByteMap) GetCol(x int) []byte {
 	if m.Repeats {
 		x = (x + m.BRX) % m.BRX
@@ -72,12 +75,14 @@ func (m *CoordByteMap) GetCol(x int) []byte {
 	}
 	return resp
 }
+
 func (m *CoordByteMap) AddRow(row []byte) {
 	y := m.BRY + 1
 	for x := 0; x < len(row); x++ {
 		m.Put(Coordinate{X: x + m.TLX, Y: y}, row[x])
 	}
 }
+
 func (m *CoordByteMap) AddCol(col []byte) {
 	x := m.BRX + 1
 	for y := 0; y < len(col); y++ {
@@ -142,9 +147,11 @@ func (m *CoordByteMap) Delete(pos Coordinate) {
 func (m *CoordByteMap) Height() int {
 	return m.BRY - m.TLY
 }
+
 func (m *CoordByteMap) Width() int {
 	return m.BRX - m.TLX
 }
+
 func (m *CoordByteMap) ReplaceAll(o, n byte) {
 	for y := m.TLY; y <= m.BRY; y++ {
 		for x := m.TLX; x <= m.BRX; x++ {
@@ -238,7 +245,7 @@ func (m *CoordByteMap) FindFirst(b byte) (Coordinate, error) {
 			}
 		}
 	}
-	return Coordinate{}, errors.New("Not Found")
+	return Coordinate{}, errors.New("not found")
 }
 
 // FindLast searches right to left, bottom to top for the last
@@ -355,18 +362,21 @@ func (m *CoordByteMap) GrowNorth(size int, val byte) {
 		m.Put(Coordinate{X: x, Y: tlY}, val)
 	}
 }
+
 func (m *CoordByteMap) GrowEast(size int, val byte) {
 	brX := m.BRX + 1
 	for y := m.TLY; y <= m.BRY; y++ {
 		m.Put(Coordinate{X: brX, Y: y}, val)
 	}
 }
+
 func (m *CoordByteMap) GrowSouth(size int, val byte) {
 	tlY := m.BRY + 1
 	for x := m.TLX; x <= m.BRX; x++ {
 		m.Put(Coordinate{X: x, Y: tlY}, val)
 	}
 }
+
 func (m *CoordByteMap) GrowWest(size int, val byte) {
 	brX := m.TLX - 1
 	for y := m.TLY; y <= m.BRY; y++ {
@@ -396,6 +406,7 @@ func (m CoordByteMap) Map(l func(c Coordinate, in byte) byte) CoordByteMap {
 	}
 	return i
 }
+
 func (m CoordByteMap) RowAsString(y int) string {
 	var res string
 	for x := m.TLX; x <= m.BRX; x++ {
@@ -403,6 +414,7 @@ func (m CoordByteMap) RowAsString(y int) string {
 	}
 	return res
 }
+
 func (m CoordByteMap) ColAsString(x int) string {
 	var res string
 	for y := m.TLY; y <= m.BRY; y++ {
@@ -470,6 +482,7 @@ func (m *Coord3dByteMap) Get(pos Coordinate3d) byte {
 	}
 	return m.Field[pos]
 }
+
 func (m *Coord3dByteMap) Opt(pos Coordinate3d, def byte) byte {
 	if v, ok := m.Field[pos]; ok {
 		return v