replace "str(" with f"format{example}"

ssl_decrypt.py

@@ -33,16 +33,16 @@ if not keyfile.is_file():
     )
     shutil.chown(keyfile, 1000, 1000)
 
-dirname2 = "/home/" + logname + "/.config/wire_py/"
+dirname2 = f"/home/{logname}/.config/wire_py/"
 detl = os.listdir(dirname2)
 os.chdir(dirname2)
 detl.remove("keys")
 detl.remove("settings")
-if os.path.exists(dirname2 + "pbwgk.pem"):
+if os.path.exists(f"{dirname2}pbwgk.pem"):
     detl.remove("pbwgk.pem")
     for detunnels in detl:
-        tlname2 = detunnels[:-4] + ".conf"
-        extpath = str(dirname) + "/" + tlname2
+        tlname2 = f"{detunnels[:-4]}.conf"
+        extpath = f"{dirname}/{tlname2}"
         check_call(
             [
                 "openssl",