Fix some clippy warnings

Author: bartnv

src/main.rs

@@ -32,8 +32,8 @@ struct Table<'a> {
 impl<'a> Table<'a> {
   fn new(path: &str, file: Option<&str>, filemode: &str, skip: Option<&'a str>) -> Table<'a> {
     let mut ownpath = String::from(path);
-    if !ownpath.is_empty() && !ownpath.starts_with("/") { ownpath.insert(0, '/'); }
-    if ownpath.ends_with("/") { ownpath.pop(); }
+    if !ownpath.is_empty() && !ownpath.starts_with('/') { ownpath.insert(0, '/'); }
+    if ownpath.ends_with('/') { ownpath.pop(); }
     Table {
       path: ownpath,
       file: match file {
@@ -187,9 +187,9 @@ fn add_table<'a>(rowpath: &str, outfile: Option<&str>, filemode: &str, skip: Opt
     let name = col["name"].as_str().unwrap_or_else(|| fatalerr!("Error: column has no 'name' entry in configuration file"));
     let colpath = col["path"].as_str().unwrap_or_else(|| fatalerr!("Error: column has no 'path' entry in configuration file"));
     let mut path = String::from(&table.path);
-    if !colpath.is_empty() && !colpath.starts_with("/") { path.push('/'); }
+    if !colpath.is_empty() && !colpath.starts_with('/') { path.push('/'); }
     path.push_str(colpath);
-    if path.ends_with("/") { path.pop(); }
+    if path.ends_with('/') { path.pop(); }
     let subtable: Option<Table> = match col["cols"].is_badvalue() {
       true => None,
       false => {