Write a Go program to calculate the SHA256 hash of a given string.
MediumProblem Statement
Write a Go program to calculate the SHA256 hash of a given string.
Sample Input
A string (e.g., "Hello, World!").
Sample Output
SHA256 Hash: dffd6021bb2bd5b0af676290809ec3a53191dd81c7f70a4b28688a362182986f
Limits
Time: 2s · Memory: 256 MB