diff --git a/src/xsv.rs b/src/xsv.rs
index fa69f76..d7a0391 100644
--- a/src/xsv.rs
+++ b/src/xsv.rs
@@ -132,14 +132,14 @@ impl<'vtab> VTab<'vtab> for XsvTable {
             args.table_name.as_str(),
         )?;
         let vtab = XsvTable {
-            base: unsafe { mem::zeroed() },
+            base: unsafe{mem::zeroed()},
             db,
-            input: arguments.filename.clone(),
+            input: arguments.filename,
             header: arguments.header,
             delimiter: arguments.delimiter,
             quote: arguments.quote,
             declared_columns: arguments.columns,
-            current_path: "".to_owned(),
+            current_path: String::new(),
             current_line_number: 0,
         };
 
@@ -238,7 +238,7 @@ impl XsvCursor {
             ))
         })?;
         let mut cursor = XsvCursor {
-            base: unsafe { mem::zeroed() },
+            base: unsafe{mem::zeroed()},
             rowid: 0,
             paths,
             current_path: None,
@@ -246,7 +246,7 @@ impl XsvCursor {
             current_line_number: 0,
             record,
             eof: false,
-            declared_columns: table.declared_columns.clone(),
+            declared_columns: table.declared_columns,
             table: table as *mut XsvTable,
         };
         cursor.next().map(|_| cursor)
@@ -336,14 +336,16 @@ impl VTabCursor for XsvCursor {
     }
 
     fn column(&self, context: *mut sqlite3_context, i: c_int) -> Result<()> {
-        let i = usize::try_from(i)
-            .map_err(|_| Error::new_message(format!("what the fuck {}", i).as_str()))?;
-
+        // Change the content of ErrMsg + Handling Negative Index
+        if i<0{
+            return Err(Error::new_message(format!("negative index {}", i).as_str()))?
+        }
         // This will typically only be None when a glob pattern is used, and the 1st sniffed CSV
         // has more column than another CSV in the same glob pattern.
         // For now we just return NULL for missing columns, not sure how flexible we should be
         // across CSV files. If it's a single file, i'm pretty sure it's not flexible
-        let value = &self.record.get(i);
+        let i = usize::try_from(i).unwrap();    // Unwrap allow, try_from send Err only for out of range number.
+        let value = &self.record.get(i);  
 
         if let Some(value) = value {
             match self.declared_columns.as_ref().and_then(|c| c.get(i)) {
diff --git a/src/xsv_fields.rs b/src/xsv_fields.rs
index 78b3a6c..781d256 100644
--- a/src/xsv_fields.rs
+++ b/src/xsv_fields.rs
@@ -43,7 +43,7 @@ impl<'vtab> VTab<'vtab> for XsvFieldsTable {
         _aux: Option<&Self::Aux>,
         _args: VTabArguments,
     ) -> Result<(String, XsvFieldsTable)> {
-        let base: sqlite3_vtab = unsafe { mem::zeroed() };
+        let base: sqlite3_vtab = unsafe{mem::zeroed()};
 
         let vtab = XsvFieldsTable { base };
 
@@ -90,7 +90,7 @@ pub struct XsvFieldsCursor {
 }
 impl XsvFieldsCursor {
     fn new() -> Result<XsvFieldsCursor> {
-        let base: sqlite3_vtab_cursor = unsafe { mem::zeroed() };
+        let base: sqlite3_vtab_cursor = unsafe{mem::zeroed()};
         let record = csv::StringRecord::new();
 
         let cursor = XsvFieldsCursor {
diff --git a/src/xsv_reader.rs b/src/xsv_reader.rs
index f834a13..eeea3d7 100644
--- a/src/xsv_reader.rs
+++ b/src/xsv_reader.rs
@@ -41,7 +41,7 @@ impl<'vtab> VTab<'vtab> for XsvReaderTable {
         args: VTabArguments,
     ) -> Result<(String, XsvReaderTable)> {
         let arguments = parse_reader_arguments(args.arguments, aux.map(|a| a.to_owned()))?;
-        let base: sqlite3_vtab = unsafe { mem::zeroed() };
+        let base: sqlite3_vtab = unsafe{mem::zeroed()};
 
         let vtab = XsvReaderTable {
             base,
@@ -117,7 +117,7 @@ impl XsvReaderCursor<'_> {
         columns: &Vec<ColumnDeclaration>,
         header: bool,
     ) -> Result<XsvReaderCursor> {
-        let base: sqlite3_vtab_cursor = unsafe { mem::zeroed() };
+        let base: sqlite3_vtab_cursor = unsafe{mem::zeroed()};
         let record = csv::StringRecord::new();
 
         let cursor = XsvReaderCursor {
@@ -198,19 +198,18 @@ impl VTabCursor for XsvReaderCursor<'_> {
     }
 
     fn column(&self, context: *mut sqlite3_context, i: c_int) -> Result<()> {
-        if i < 1 {
+        if i < 0 {
             return Ok(());
         }
-        let i = usize::try_from(i - 1)
-            .map_err(|_| Error::new_message(format!("what the fuck {}", i).as_str()))?;
+        let i = usize::try_from(i).unwrap(); // i is positive
         let column = self
             .columns
             .get(i)
-            .ok_or_else(|| Error::new_message("what the fuck"))?;
+            .ok_or_else(|| Error::new_message("OutOfRange Index ?"))?;
         let s = &self
             .record
             .get(i)
-            .ok_or_else(|| Error::new_message(format!("wut {}", i).as_str()))?;
+            .ok_or_else(|| Error::new_message(format!("wut {}", i)))?;
         column.affinity().result_text(context, s)?;
         Ok(())
     }
@@ -254,7 +253,7 @@ fn parse_reader_arguments(
                     _ => (),
                 },
             },
-            Err(err) => return Err(Error::new_message(err.as_str())),
+            Err(err) => return Err(Error::new_message(err)),
         };
     }
     let delimiter = delimiter.ok_or_else(|| {
diff --git a/src/xsv_rows.rs b/src/xsv_rows.rs
index d992551..c59d165 100644
--- a/src/xsv_rows.rs
+++ b/src/xsv_rows.rs
@@ -148,7 +148,7 @@ pub struct XsvRowsCursor {
 }
 impl XsvRowsCursor {
     fn new(delimiter: Option<u8>) -> Result<XsvRowsCursor> {
-        let base: sqlite3_vtab_cursor = unsafe { mem::zeroed() };
+        let base: sqlite3_vtab_cursor = unsafe{mem::zeroed()};
         let record = csv::StringRecord::new();
 
         let cursor = XsvRowsCursor {
@@ -221,7 +221,7 @@ impl VTabCursor for XsvRowsCursor {
                     "Error: UTF8 error while reading next row",
                 )),
                 _ => Err(Error::new_message(
-                    format!("Error reading: {}", err).as_str(),
+                    format!("Error reading: {}", err),
                 )),
             },
         }