Can someone help me code? urgent!

Using Dart SDK create an application that generates a password.

Password should follow the criteria listed below:

• Passwords should have a at least 1 lowercase letters, 1 uppercase letters, 1 number, and 1 symbol.
• Generated passwords should be random, generating a new password every time the user asks for a new password.
• Include your run-time code in a main method.

Following function should present on your application with their corresponding actions:

• shuffleGenerator - function to create/generate a random sequence of characters
• passwordGenerator - function that calls the shuffleGenerator function. With the following parameter. e.g. passwordGenerator ("weak")
  • weak - password to be generated is 5 characters
  • medium - password to be generated is 15 characters
  • strong - password to be generated is 25 characters
• Inform the user of the requirement if they selected a different parameter not listed on the given items (weak, medium,strong).
• Save the application with the filename passgen.dart