Remove repeated `contains` calls

Cargo.toml

@@ -83,3 +83,4 @@ clap = { version = "2.33", optional = true }
 [profile.release]
 lto = true
 codegen-units = 1
+# debug = true

src/controller.rs

@@ -197,6 +197,8 @@ impl<'b> Controller<'b> {
         let mut first_range: bool = true;
         let mut mid_range: bool = false;
 
+        let style_snip = self.config.style_components.snip();
+
         while reader.read_line(&mut line_buffer)? {
             match line_ranges.check(line_number) {
                 RangeCheckResult::BeforeOrBetweenRanges => {
@@ -207,7 +209,7 @@ impl<'b> Controller<'b> {
                 }
 
                 RangeCheckResult::InRange => {
-                    if self.config.style_components.snip() {
+                    if style_snip {
                         if first_range {
                             first_range = false;
                             mid_range = true;