add fs lib to walk file tree

utils.go

@@ -0,0 +1,11 @@
+package main
+
+// Removes the first occurence from the slice. Worst case O(n)
+func RemoveFromSlice[T comparable](slice []T, item T) []T {
+	for i, v := range slice {
+		if v == item {
+			return append(slice[:i], slice[i+1:]...)
+		}
+	}
+	return slice
+}