go get -u github.com/sujamess/numconword

package main

import (
    "fmt"
    
    "github.com/sujamess/numconword"
)

func main() {
    readableWords, err := numconword.ConvertFloat64(123456.78)
    if err != nil {
        // handle error
    }
    
    // one hundred twenty three thousand fifty six point seventy eight
    fmt.Println(readableWords)
}