resolved conditional suggestion and fixed arg help

pkg-install

@@ -9,7 +9,7 @@ import subprocess
 parser = ArgumentParser(description="Install AUR packages into a Docker container")
 parser.add_argument("package_name", type=str, help="name of the AUR package")
 parser.add_argument("-x", type=str, metavar='EXECUTABLE', help="name of executable")
-parser.add_argument("-e", type=str, help="edit generic dockerfile")
+parser.add_argument("-e", type=str, help="add extra step in dockerfile")
 args = vars(parser.parse_args())
 
 package_name = args['package_name']
@@ -42,13 +42,8 @@ RUN git clone https://aur.archlinux.org/yay.git
 WORKDIR /home/{user}/yay
 RUN makepkg -si --noconfirm
 
-"""
-if edit_flag is not None: #if -e flag is passed then take on the following string
-    extra_run = f"""RUN {edit_flag}"""
-else:
-    extra_run = ""
-
-dockerfile += extra_run + f"""
+#add extra step
+{"RUN " + edit_flag if edit_flag is None else ""}
 
 # Now you can play with whatever package you'd like
 RUN yay -S --noconfirm {package_name}