A useful macro for putting together strings in a low overhead manner for `no_std` + `alloc` apps.
```rust
let name = "Richard";
let msg:String = string_concat!("Hello ",name,"!");
```
saves you from typing
```rust
let name = "Richard";
let msg:String = {
let temp_string = String::new();
temp_string.push_str("Hello");
temp_string.push_str(name);
temp_string.push_str("!");
temp_string
}
```
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