extract string at a specified position and return a certain number of characters in dart code example
Example: flutter substring
var string = 'dartlang';
string.substring(1); // 'artlang'
string.substring(1, 4); // 'art'
var string = 'dartlang';
string.substring(1); // 'artlang'
string.substring(1, 4); // 'art'