Complete set 1 challenge 1.

src/main.rs

@@ -1,8 +1,20 @@
 mod set1;
 
-use crate::set1::convert_hex_to_base64;
+use crate::set1::{base64_to_string, bytes_to_base64, to_bytes};
+
+fn test_set1() {
+    let input = to_bytes("49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d");
+    let expected = String::from("SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t");
+    match input {
+        Ok(bytes) => {
+            let output = base64_to_string(bytes_to_base64(bytes));
+            assert_eq!(output, expected);
+            println!("{:?}", output);
+        }
+        Err(e) => println!("Error: {:?}", e),
+    };
+}
 
 fn main() {
-    println!("Hello, world! Does it work?");
-    convert_hex_to_base64();
+    test_set1();
 }