Convert the string values in float64 for asciigraph

The graph requires the input data type to float64, which requires me to
first convert and then round to two decimal places.

cmd/graph.go

@@ -18,7 +18,10 @@ package cmd
 import (
 	"encoding/json"
 	"fmt"
+	"math"
+	"strconv"
 
+	"github.com/guptarohit/asciigraph"
 	api "github.com/jasonbirchall/crypto-tracker/internal/api"
 	"github.com/spf13/cobra"
 )
@@ -41,9 +44,9 @@ var graphCmd = &cobra.Command{
 			return err
 		}
 
-		// graph := asciigraph.Plot(data, asciigraph.Height(height))
+		graph := asciigraph.Plot(data, asciigraph.Height(height))
 
-		fmt.Println(data)
+		fmt.Println(graph)
 
 		return nil
 	},
@@ -53,9 +56,9 @@ var graphCmd = &cobra.Command{
 // graph command. It queries the API package and collates a collection of
 // float64 data type. This collection is then returned back to the command
 // function.
-func getData(coin string) ([]string, error) {
+func getData(coin string) ([]float64, error) {
 	var p Price
-	var arr []string
+	var arr []float64
 
 	data, err := api.Query(coin)
 
@@ -64,8 +67,17 @@ func getData(coin string) ([]string, error) {
 		return arr, err
 	}
 
+	// Iterate over all strings in struct and convert to float64, which
+	// is requried by the asciigraph package.
 	for _, v := range p.DataPoints {
-		fmt.Println(v)
+		s, err := strconv.ParseFloat(v, 64)
+		if err != nil {
+			return arr, err
+		}
+
+		r := math.Round(s*100) / 100
+
+		arr = append(arr, r)
 	}
 
 	return arr, nil