clippy happy

src/day00.rs

@@ -1,9 +1,9 @@
-pub fn process_part_1(input: &str) -> u32 {
-    return 0;
+pub fn process_part_1(_input: &str) -> u32 {
+    0
 }
 
-pub fn process_part_2(input: &str) -> u32 {
-    return 0;
+pub fn process_part_2(_input: &str) -> u32 {
+    0
 }
 
 #[cfg(test)]