Update app.py

app.py

@@ -37,9 +37,8 @@ def repl(rs,rt,uu):
     r_file = file.read()
     r_file = r_file.replace(f'{rs}',f'{rt}')
     o_file = open(f'mod_{uu}','w')
-    o_file = o_file.writelines(r_file)
+    o_file = o_file.write(r_file)
     file.close()
-    o_file.close()
     return r_file, f'{o_file}'