fix(empty string): boolean logic mistake

src/controller/view_utils/input_utils.rs

@@ -9,7 +9,7 @@ const ASCII_ZERO_CHAR_POSITION: u8 = 48;
 pub fn processing_input(input: &String) -> String {
     input
         .split_ascii_whitespace()
-        .filter(|&x| x.is_empty())
+        .filter(|&x| !x.is_empty())
         .fold(String::new(), |c: String, n: &str| c + n)
 }