add libpike and some main testing

libpike/util/util.odin

@@ -0,0 +1,11 @@
+package util
+
+import "core:strings"
+
+basename :: proc(path: string) -> string {
+	idx := strings.last_index_byte(path, '/')
+	if idx < 0 {
+		return path
+	}
+	return path[idx+1:]
+}