diff --git a/src/validate.rs b/src/validate.rs
index a544b57..55ae5c2 100644
--- a/src/validate.rs
+++ b/src/validate.rs
@@ -32,7 +32,6 @@ pub fn validate(verbosity: u8, config: util::config::Config) {
 
     print_unmached(in_to_out.1);
     print_invalid_pairs(invalid, in_suffix, out_suffix);
-
 }
 
 /**
@@ -110,7 +109,7 @@ fn map_files(in_files: Vec<PathBuf>, out_files: Vec<PathBuf>, config: &util::con
 
     cl.retain(|x| !r.contains(&x));
     res.1.append(&mut cl);
-    println!("{:?}", res);
+    // println!("{:?}", res);
     return res;
 }
 
@@ -124,7 +123,15 @@ fn map_files(in_files: Vec<PathBuf>, out_files: Vec<PathBuf>, config: &util::con
  * @return A vector of tuples with (input, output) PathBufs
 */
 fn check_mappings(mappings: Vec<(PathBuf, PathBuf)>, in_suffix: &str, out_suffix: &str) -> Vec<(PathBuf, PathBuf)> {
-    return vec![(PathBuf::from("a"), PathBuf::from("b"))];
+    let mut res: Vec<(PathBuf, PathBuf)> = vec![];
+
+    for tup in &mappings {
+        if !(tup.0.as_path().extension().unwrap() == in_suffix) || !(tup.1.as_path().extension().unwrap() == out_suffix) {
+            res.push(tup.clone());
+        }
+    }
+    // println!("{:?}", res);
+    return res;
 }
 
 /**
@@ -144,7 +151,7 @@ fn collect_invalid(files: &Vec<PathBuf>, suf: &str) -> Vec<PathBuf> {
             res.push(file.clone());
         }
     }
-
+    println!("{:?}", res);
     return res
 }
 /**
@@ -320,7 +327,7 @@ mod tests {
         print_invalid_pairs(invalid.clone(), in_suffix, out_suffix);
         assert!(&invalid.contains(&(in_files[0].clone(), out_files[0].clone())));
         assert!(&invalid.contains(&(in_files[1].clone(), out_files[1].clone())));
-        assert!(&invalid.contains(&(in_files[2].clone(), out_files[2].clone())));
+        assert!(!&invalid.contains(&(in_files[2].clone(), out_files[2].clone())));
 
         assert!(!&invalid.contains(&(in_files[3].clone(), out_files[3].clone())));
         assert!(!&invalid.contains(&(in_files[4].clone(), out_files[4].clone())));