ConvertStringToFloat

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(customParseToFloat64("-12.345678"))
}

func customParseToFloat64(input string) (result float64) {
	powerOfTen := []int{1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000}
	pointPosition := -1
	n := 0.0
	numericCount := 0

	reversal := 1
	if strings.HasPrefix(input, "-") {
		reversal = -1
		input = input[1:len(input)]
	}

	for index, value := range input {
		if value == '.' {
			pointPosition = index
		} else {
			distance := float64(value - '0')
			n = (n * 10) + distance
			numericCount++
		}
	}
	if pointPosition == -1 {
		result = n
	} else {
		result = n / float64(powerOfTen[numericCount-pointPosition])
	}
	result = result * float64(reversal)
	return
}