Day 2 initial solution

There's room to optimize part 2, but I wanted to commit my original brute-force solution first.

utilities/intcode.go

@@ -0,0 +1,47 @@
+package utilities
+
+import (
+	"strconv"
+	"strings"
+)
+
+func ParseIntcodeProgram(programStr string) []int64 {
+	nums := strings.Split(programStr, ",")
+	program := make([]int64, len(nums))
+	for idx, num := range nums {
+		iNum, err := strconv.ParseInt(num, 10, 64)
+		if err != nil {
+			panic(err)
+		}
+		program[idx] = iNum
+	}
+
+	return program
+}
+
+func RunIntcodeProgram(program []int64) {
+	for instructionPointer := 0; instructionPointer < len(program); {
+		opcode := program[instructionPointer]
+		switch opcode {
+		case 1:
+			param1 := program[instructionPointer+1]
+			param2 := program[instructionPointer+2]
+			param3 := program[instructionPointer+3]
+			program[param3] = program[param1] + program[param2]
+
+			instructionPointer += 4
+			break
+		case 2:
+			param1 := program[instructionPointer+1]
+			param2 := program[instructionPointer+2]
+			param3 := program[instructionPointer+3]
+			program[param3] = program[param1] * program[param2]
+
+			instructionPointer += 4
+			break
+		case 99:
+			instructionPointer = len(program)
+			break
+		}
+	}
+}

utilities/parsing.go

@@ -24,6 +24,17 @@ func getData(filename string, lineHandler func(line string)) {
 	}
 }
 
+func GetStringContents(filename string) string {
+	var retval string
+	getData(filename, func(line string) {
+		if len(retval) != 0 {
+			panic("tried to parse multi-line file as a single line")
+		}
+		retval = line
+	})
+	return retval
+}
+
 func GetStringLines(filename string) []string {
 	retval := make([]string, 0)
 	getData(filename, func(line string) {