minor refactor but i think no problem

cmd/cli/main.go

@@ -171,21 +171,26 @@ func FPrintBalances(w io.Writer, linePrefix string, balances, cumulatives ledger
 	}
 	for i, key := range keys {
 		printableKey := key
-		if !fullKey && i > 0 {
-			j := 0
-			n := len(keys[i])
-			if n2 := len(keys[i-1]); n2 < n {
-				n = n2
-			}
-			for j = 0; j < n; j++ {
-				if keys[i-1][j] != keys[i][j] {
-					break
+		if fullKey {
+		} else if i == 0 {
+		} else {
+			commonPrefixLen := func() int {
+				j := 0
+				n := len(keys[i])
+				if n2 := len(keys[i-1]); n2 < n {
+					n = n2
 				}
-			}
-			for keys[i][j] != ':' && j > 0 {
-				j -= 1
-			}
-			printableKey = strings.Repeat(" ", j) + keys[i][j:]
+				for j = 0; j < n; j++ {
+					if keys[i-1][j] != keys[i][j] {
+						break
+					}
+				}
+				for keys[i][j] != ':' && j > 0 {
+					j -= 1
+				}
+				return j
+			}()
+			printableKey = strings.Repeat(" ", commonPrefixLen) + keys[i][commonPrefixLen:]
 		}
 
 		currencies := []ledger.Currency{}