learned I didn't need git for external modules and different folders can have different mains

pkg/datafile/floats.go

@@ -0,0 +1,32 @@
+package datafile
+
+import (
+	"bufio"
+	"os"
+	"strconv"
+)
+
+// GetFloats reads a float64 from each line of a file.
+func GetFloats(fileName string) ([]float64, error) {
+	var numbers []float64
+	file, err := os.Open(fileName)
+	if err != nil {
+		return nil, err
+	}
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		number, err := strconv.ParseFloat(scanner.Text(), 64)
+		if err != nil {
+			return nil, err
+		}
+		numbers = append(numbers, number)
+	}
+	err = file.Close()
+	if err != nil {
+		return nil, err
+	}
+	if scanner.Err() != nil {
+		return numbers, scanner.Err()
+	}
+	return numbers, nil
+}

pkg/datafile/strings.go

@@ -0,0 +1,31 @@
+package datafile
+
+import (
+	"bufio"
+	"os"
+)
+
+func GetStrings(filename string) ([]string, error) {
+	var lines []string
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		lines = append(lines, line)
+	}
+
+	err = file.Close()
+	if err != nil {
+		return nil, err
+	}
+
+	if scanner.Err() != nil {
+		return nil, scanner.Err()
+	}
+
+	return lines, nil
+}