How long does it take to enter a number for a given keypad

keypad.go

package main

import "fmt"

type Keypad struct {
	matrix [3][3]string
}

func NewKeypad(keypad string) Keypad {
	var result Keypad
	x, y := 0, 0
	for _, c := range keypad {
		result.matrix[y][x] = string(c)
		x++
		if (x > 2) {
			y++
			x = 0
		}
	}
	return result
}

func (k *Keypad) Print() {
	fmt.Print("-------\n")
	for _, row := range k.matrix {
		for _, letter := range row {
			fmt.Print("|" + string(letter))
		}
		fmt.Print("|\n-------\n")
	}
}

func (k *Keypad) Coord(key string) (int, int) {
	for x, row := range k.matrix {
		for y, letter := range row {
			if string(letter) == key {
				return x, y
			}
		}
	}
	return -1, -1
}

func (k *Keypad) Distance(s1, s2 string) int {
	if s1 == s2 {
		return 0
	}

	x1, y1 := k.Coord(s1)
	x2, y2 := k.Coord(s2)

	// Manhattan distance
	dist := abs(x2 - x1) + abs(y2 - y1)

	// Diagonal distance is 2, should be 1 for our case
	if abs(x2 - x1) == 1 && abs(y2 - y1) == 1 {
		dist = 1
	}

	return dist
}

// Absolute value for integers
func abs(x int) int {
	if x < 0 {
		return -x
	}
	return x
}

func entryTime(s string, keypad string) int32 {
	var result int32 = 0

	k := NewKeypad(keypad)

	for i := 0; i < len(s)-1; i++ {
		key := string(s[i])
		nextKey := string(s[i+1])

		dist := k.Distance(key, nextKey)
		if dist == 1 {
			result += 1
		}
		if dist > 1 {
			result += 2
		}
	}

	return result
}

func main() {
	fmt.Println("= test", entryTime("423692", "923857614"), "expected", 8)
	fmt.Println("= test", entryTime("5111", "752961348"), "expected", 1)
	fmt.Println("= test", entryTime("91566165", "639485712"), "expected", 11)
}