In Go, you can use the ioutil package to read a file. Here is an example of how to read the contents of a file into a string (code read_file_example1.go)
In this example, the ReadFile function is used to read the contents of the file "example.txt" into the variable data. If there is an error reading the file, it will be returned as the second variable err.
You can also use os.Open and defer file.Close() to read the file and close it after you finish reading it. (See read_file_example2.go)
This read the file contents and close the file after the operation is done.