ianadiwibowo/central-park

package main

import (
    "fmt"
    "strings"
    "time"
)

func NoCornerSquare(squareSize int) string {
    if squareSize <= 0 {
        return "Please insert a valid number"
    }

    firstAndLastRow := constructRow(squareSize, " ", "x")
    middleRow := constructRow(squareSize, "x", " ")

    var result strings.Builder

    result.WriteString(firstAndLastRow)
    for row := 0; row < squareSize; row++ {
        result.WriteString(middleRow)
    }
    result.WriteString(firstAndLastRow)

    return removeLastNewline(result.String())
}

func constructRow(n int, char1, char2 string) (result string) {
    var res strings.Builder

    res.WriteString(char1)
    res.WriteString(constructColumn(n, char2))
    res.WriteString(char1)
    res.WriteString("\n")

    return res.String()
}

func constructColumn(n int, char string) string {
    return strings.Repeat(char, n)
}

func removeLastNewline(s string) string {
    return s[:len(s)-1]
}

func main() {
    for squareSize := 0; squareSize <= 50000; squareSize += 2000 {
        measure(squareSize)
    }
}

func measure(squareSize int) {
    defer timeTrack(time.Now(), fmt.Sprintf("%v", squareSize))
    _ = NoCornerSquare(squareSize)
}

func timeTrack(start time.Time, identifier string) {
    elapsed := time.Since(start)
    fmt.Printf("%v, %v\n", identifier, elapsed.Milliseconds())
}