patched some warning for raw int to string conversions

2019/day17/part1/main.go

@@ -6,6 +6,8 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/alexchao26/advent-of-code-go/cast"
+
 	"github.com/alexchao26/advent-of-code-go/util"
 )
 
@@ -80,7 +82,7 @@ func (robot *Robot) GetFloorGrid() {
 			row++
 			robot.floorGrid = append(robot.floorGrid, []string{})
 		default:
-			tileType := string(v)
+			tileType := cast.ASCIIIntToChar(v)
 			robot.floorGrid[row] = append(robot.floorGrid[row], tileType)
 		}
 	}