fixed a bug in fixed_width

src/make_prompt.rs

@@ -14,7 +14,7 @@ fn fixed_width(input: &String, len: usize) -> String
     {
         let cut_to = len - 1_usize;
         let start_from = clen - cut_to;
-        let cutted_result = &input[start_from..];
+        let cutted_result: String = input.chars().skip(start_from).collect();
         let mut result: String = String::from(PLACE_HOLDER);
         
         result.push_str(&cutted_result);