Function message_string_set 

pub fn message_string_set(dest: &mut [i8], src: &str) -> Result<usize>

Copies a Rust string slice into a fixed-size C-style char array within a message.

This is a safe wrapper around CFE_SB_MessageStringSet. It handles truncation and null-padding correctly.

Arguments

• dest: A mutable slice representing the fixed-size char array in the message.
• src: The Rust string slice to copy from.