Replace starts_with("#") with starts_with('#')

Author: ageron

crates/repl_cli/src/lib.rs

@@ -64,7 +64,7 @@ pub fn main() -> i32 {
                 if line
                     .lines()
                     .map(|ln| ln.trim())
-                    .all(|ln| ln.is_empty() || ln.starts_with("#"))
+                    .all(|ln| ln.is_empty() || ln.starts_with('#'))
                 {
                     // if there are only whitespaces and comments, don't run it
                     println!();