Banger

Explanation

This program uses the strings standard library to manipulate strings passed when running it from the terminal.

The os.Args function is used to accept the argument.

The strings.Repeat function repeats the '!' based on the length of the passed argument. strings.ToUpper converts the result to uppercase.

Usage

go run main.go string

string can be anything here e.g. hey, hello, e.t.c