fn switch_base(c: char) -> char {
        match c {
            'A' => 'T',
            'a' => 't',
            'C' => 'G',
            'c' => 'g',
            'T' => 'A',
            't' => 'a',
            'G' => 'C',
            'g' => 'c',
            'N' => 'N',
            'n' => 'n',
            _ => 'N',
        }
    }
// switch lowercase letters too here.
switch lowercase letters too here.
switch lowercase letters too here .
fn switch_base(c: char) -> char {
        match c {
            'A' => 'T',
            'a' => 't',
            'C' => 'G',
            'c' => 'g',
            'T' => 'A',
            't' => 'a',
            'G' => 'C',
            'g' => 'c',
            'N' => 'N',
            'n' => 'n',
            _ => 'N',
        }
    }
fn switch_base ( c : char ) -> char { match c { 'A' => 'T' , 'a' => 't' , 'C' => 'G' , 'c' => 'g' , 'T' => 'A' , 't' => 'a' , 'G' => 'C' , 'g' => 'c' , 'N' => 'N' , 'n' => 'n' , _ => 'N' , } }
switch lowercase letters too here.
switch lowercase letters too here .
c
char
c
char