Runs a go fmt

internal/graph/graph.go

 package graph
 
 import (
+	"errors"
 	"fmt"
 	"math"
 	"path/filepath"
 	"sort"
-	"errors"
 	"strconv"
 	"strings"
 

internal/graph/graph_test.go

 type TrimTreeTestCase struct {
 	Initial  *Graph
 	Expected []ExpectedNode
-	Keep nodePtrSet
+	Keep     nodePtrSet
 }
 
 // Makes the edge from parent to child residual