Wrote write goroutine functions.

Refactored subpackages back to root package.

cypher.go

@@ -0,0 +1,39 @@
+package heartwood
+
+import (
+	"fmt"
+	"strings"
+)
+
+// ========================================
+// Cypher Formatting Functions
+// ========================================
+
+// ToCypherLabel converts a node label or relationship type into its Cypher
+// format.
+func ToCypherLabel(label string) string {
+	return fmt.Sprintf(":`%s`", label)
+}
+
+// ToCypherLabels converts a list of node labels into its Cypher format.
+func ToCypherLabels(labels []string) string {
+	var cypherLabels []string
+
+	for _, label := range labels {
+		cypherLabels = append(cypherLabels, ToCypherLabel(label))
+	}
+
+	return strings.Join(cypherLabels, "")
+}
+
+func ToCypherProps(keys []string, prefix string) string {
+	if prefix == "" {
+		prefix = "$"
+	}
+	cypherPropsParts := []string{}
+	for _, key := range keys {
+		cypherPropsParts = append(
+			cypherPropsParts, fmt.Sprintf("%s: %s%s", key, prefix, key))
+	}
+	return strings.Join(cypherPropsParts, ", ")
+}