fix: remove row and col loops

cmd/07/main.go

@@ -17,17 +17,12 @@ func SolvePartOne(filePath string) int {
 
 	var startPosition position.Position
 
-	for row := range grid.NumberOfRows() - 1 {
+	for p, v := range grid.Positions() {
-		for col := range grid.NumberOfColumns() - 1 {
-			current := position.From(row, col)
-			v := grid.GetValueAt(current)
-
 		if v == StartCharacter {
-				startPosition = current
+			startPosition = p
 			break
 		}
 	}
-	}
 
 	if startPosition == nil {
 		panic("unable to find start location")